Author Archives: mickbeltz

Thinking through Attendance

Michael Beltz, Department of Philosophy & Religion, University of North Dakota

Over the last several years, I have had a shift in my thinking about attendance in my courses. Now, as I think about my courses in the spring semester, I may be changing my views once again. The specific issue I am currently wrestling with is whether to formally take attendance every class period. This is not an issue I am concerned with for most of my courses. I do not feel that it is necessary in small seminar classes. In those classes, because of their discussion format, I am able to learn student’s names rapidly and naturally. Nor am I concerned with large lecture classes (over 75 students). In these classes, developing a personal connection with the majority of the students is unrealistic. My concern is whether to implement formal attendance in mid-size classes (between 25 and 75 students). My structure for this size of a class is a hybrid format of lectures, group activities, and whole class discussions. In the large scale lecture course, even in an active discussion, only a small minority of students will be able to contribute to the discussion. In the small seminar class, time typically permits all students to contribute to the discussion. The hybrid nature and the number of students in the mid-size courses make these classes problematic. In these classes, it is possible to hear from a majority of students, but not all students. This is a challenge because these mid-size courses demand that students be involved with the collective learning activities. This requires that students be present and prepared for the class; missing either of these undermines the class goals.

The question is: Should I formally take attendance in my mid-level courses?

Argument against attendance #1: Formally taking attendance is overly time-consuming (or counterproductive).

At the University of North Dakota, if a class meets three days a week, each class period is only 50 minutes long. Even if attendance is only takes 5 minutes (which for me is optimistic in a 75 student class), this means that 10% of any course is spent on this activity rather than on the course subject matter. There is a two-fold problem with this. First, students are paying for this time, but it does not have any direct value to their learning. Second, by adding formal attendance taking to a course, I would only be able to cover 90% of the material that I would otherwise be able to cover. In addition, since this missing 10% would not come from a single course period, all of the daily course plans would need to be revamped and revisited.

There seems to be at least two different responses that might be given to this argument. First, it might be possible to formally take attendance without spending valuable class time. One solution might be to hand-around a sign-in sheet (or some other strategy like daily quizzes) where students record their attendance while the class is going on. Unfortunately, this approach comes with two costs. There is the potential for students to cheat the system and falsify attendance (by having someone else sign them in). Additionally, having a sign-in sheet pass through a class means that every student will be distracted from the class concepts and activities at some point; thus undermining the argument in favor of the sign-in sheet. Second, this argument can be criticized for conflating amount of time in the class with productivity in the class. If taking attendance were to make students more attentive, understand concepts better, or learn more, then it would be worth the lost 10% of the total course. This, obviously, does not mean that taking attendance makes students learn more efficiently (more data would be needed for this claim); it simply means that the use of time in this manner is not sufficient grounds for rejecting attendance.

Argument against attendance #2: It is not the proper role of an instructor to take attendance.

An instructor’s primary role in any class is to provide a quality experience for students. This experience should be based on the professional expertise of the instructor combined with the instructor’s judgment as to what should be learned and how the content and/or skills are best covered in the course. Formally taking attendance is not often seen as the most appropriate role of the instructor. Students’ have a role in their education, too. This is usually understood to include being present and prepared for each class period.  In this understanding of the roles of the instructor and the students, being present would clearly be the students’ responsibility, not the instructors.  By taking attendance, the instructor is taking the burden of this responsibility.

This argument revolves around the idea that all individuals in the learning process have obligations and responsibilities; if either the instructor or the student fails to meet their responsibilities, the learning process breaks down. I am receptive to this general proposition, but the idea of multiple responsible agents does not mean that the responsibility rests just on one individual. Attendance in a class is not just the students’ responsibility, even if the responsibility is unevenly on the students’ shoulders. For example, one responsibility that students have toward their own education is to ask questions of the instructor when they do not understand the course concepts. Instructors have the ability to discourage or encourage this type of discussion. Even though it is primarily the students’ responsibility to ask for clarification, the instructor has a reasonable responsibility to be accessible to students, to answer questions, and to be open to a discussion of the concepts. This same principle applies to attendance. Attendance is primarily the students’ responsibility, but instructors have some limited responsibilities (like giving incentives for attendance and making sure there are not disincentives for attendance).

Argument against attendance #3: Students are adults with free-will and should be allowed to make up their own minds as to whether they come to class or not.

Different individuals have different values. As adults, students should be allowed to establish their own priorities and act on their values (as long as those actions do not harm other individuals). If a student has determined that some other activity has a higher value to them than attending a class period that is his or her choice. To supersede this judgment is to see the students as less legitimate decision makers than the instructor. This is a clear case of paternalism. Equally important, students who do not attend class regularly will be found out. In the end, their grades will likely be lower than their classmates.

This argument hinges on the relationship between paternalism and attendance policies. It argues that formally taking attendance forces students to conform to the values of the instructor and not to act in ways that they might normally choose. There are two problems with this argument. First, there is nothing about formally taking attendance that undermines the students’ autonomy. They still are allowed to make decisions based on their values. Class attendance is still voluntary, but the consequences of noncompliance are clear and reinforced in every class period. If anything, attendance policies make students better decision makers because they have more information available to them when they compare their values. Secondly, paternalism is rampant and beneficial in mid-size classes. Instructors have guidelines for all sorts of class behavior (both within the classroom and outside activities involving the course). Students respond to these guidelines all of the time. Taking attendance shows students that the instructor values students being in class and that the instructor believes that regular class attendance increases the effectiveness of the course. This is no different from telling students that they cannot sleep during class. This is paternalistic, since it tells students how to behave, but this does not make it wrong to try to stop this behavior.

Argument for attendance #1: It holds students accountable for their actions.

Like most people, students do not want to do things that they will not get credit for. Since most educators see attendance as beneficial to learning, formally taking attendance creates a direct and immediate benefit to the student. It gives them credit for the action and costs them when they violate the expected behavior. Students know what is expected of them and can act accordingly. Even if attendance corresponds to success on class assignments, these evaluations are more sporadic. Formally taking attendance gives daily feedback to the student about whether they are meeting the course expectations. This direct and immediate feedback is more meaningful and lasting because of its regularity.

I am sympathetic to the idea of creating positive incentives to encourage beneficial student behaviors. However, it is not clear that formally taking attendance is incentivizing the right behaviors. Taking attendance does create an incentive to be in class, but only that action. It does hold students accountable for whether they are in class at a specific time, but it ends there. The incentives push students towards coming to class even if they have not prepared, are sick, or cannot stay awake for 50 minutes. Taking attendance, by itself, encourages students to come to class, but does not encourage them to be actively engaged with the class.

Argument for attendance #2: It provides data about the effectiveness of teaching.

In theory, there should be a correlation between class attendance and final class grade. This does not mean that a student with perfect attendance will get a good grade or that a student could not receive a strong grade despite spotty attendance. However, when we look at a cohort of students, there should be a direct benefit between class attendance and what students learn. Formally taking attendance provides direct evidence as to who was in each class and how often a student was not present. This data should allow us to determine whether what we do in class is effective. If the correlation between attendance and final outcomes are strong, this indicates that classroom time is important to student progress. If students who attend regularly and students that attend irregularly earn the same grades, this indicates that class times and activities do not provide students with information or tools necessary for success. (It is important to note again that this should apply to large groups of students and might not reflect every student outcome). The additional data provided by taking attendance also allows us to examine the success of class activities. We can compare the correlations between attendance and grades to determine what activities have the greatest impact (not just what students prefer).

This defense of formal attendance is nice in theory, but does not seem strong in practice. It is true that we end up with more data to think about, but that data is only useful when it is actually analyzed. This means that we would need to use this data in a systematic and sound manner to analyze a course. This seems unrealistic for most instructors, since it would require timely (and potentially massive) data analysis. Instead, it seems more probable that this additional data would only be used anecdotally and it would be susceptible to confirmation bias.

Argument for attendance #3: It provides supporting evidence for determining some components of students’ grades.

Many classes incorporate points in their grading schemes that come from discussion, participation, attendance, or some other structure that rewards students for being prepared and involved in collective learning. Unfortunately, most assessment in these areas is highly subjective. Having accurate and complete attendance records provides a defensive argument if a student challenges any of these subjective grades. If a student complains that they ended up with a B for class participation, an objective number can be used in a disagreement. As the university structure moves increasingly towards a contractual and legalistic framework, this objective data protects instructors’ interests.

This argument seems to be reversed from the previous argument. It may be great in practice, but it is problematic in theory. It may prevent challenges to individual grades, but it provides false security and seems to be based on a lie. Attendance is clearly a necessary condition for participation and active learning, but attendance is not a sufficient condition. Students cannot participate in class if they are not there, but mere presence does not affect participation. Using class attendance as a sole justification for a participation grade conflates these two aspects of education. It also provides a false sense of objectivity to how these grades are determined.

Rethinking the Case Study Model for the Humanities

Michael Beltz, Department of Philosophy & Religion, University of North Dakota

Over the past decade, there has been a resurgence within higher education teaching literature, of advocates for using case studies as a tool for successful student engagement. The idea is that instructors can increase learning outcomes by providing concrete and detailed cases for students to explore. This exploration can occur at many levels of instruction, from individual explorations, to small-group interactions, to whole cohort focusing discussions. What is most striking about this resurgence is how the values promoted by this approach have developed out of specific disciplines. Specifically, the benefits and weaknesses of the use of case studies are products of the two academic disciplines (Engineering and Health Sciences) that have been at the forefront of this resurgence in the use of case studies. It is my proposal that the use of case studies in the humanities rethinks the potential advantages of case studies, without abandoning the strengthens that have made their use appealing.

The use of case studies as a tool for educational development has three main advantages. The main strength of case studies is how they frame the students in their own learning. Caroline Whitbeck, a prominent engineering ethicist, warns against how modern engineering and modern ethics courses are structured. The danger is that we allow individuals to passively experience their educations. Formulas are presented in their finalized and whole forms; problems are explored after they have been resolved; and, entire educational fields are explained to students in linear and concise narratives. Whitbeck argues that the goal of ethics should be to design courses so that students will be engaged participants who design good choices, rather than detached spectators who merely criticize choices made by others. Case studies can help this transformation to occur within our students, by shifting their perspectives. Instead of being docile bodies that absorb completed solutions, well-constructed case studies force students to place themselves in the shoes of the characters in the case. They are forced to confront how they would act in the situations that are presented. This occurs in a controlled and safe environment, so there is less pressure; case study activities are akin to the science laboratory (constructed problems, all of the equipment necessary for completion is provided, assistance on working through tough parts, etc.). It is this advantage that has led many academics to include case studies as a form of experiential or hands-on learning.

The second advantage that the case studies provide is richness of details. When case studies are fully developed, they provide information and details that make any subsequent discussions more enlivened. This is because they provide situations that are overdetermined; there are multiple ways to explain the events that are presented and multiple details that may be addressed by different students. The idea is that case studies allow for the inclusion of details and contributing factors that are often left out of contrived and artificial examples. This helps students develop their critical thinking skills by allowing students to make their own determination of what details are important and relevant. The use of case studies in health service education benefits greatly from this advantage. Nursing students, when presented with a rich set of details need to be able to distinguish which details and factors are relevant to the underlying condition and which are red herrings. The same general principle is important for other disciplines, providing students with the opportunity to sort between relevant information and irrelevant information, argue for these distinctions, and defend those determinations.

The third advantage that case studies have is their underlying reality. In both engineering and health sciences, case studies tend to be derived from existing real-world situations. Thus, when students are presented with a case study, the significance of the student’s decisions is amplified. The individuals presented in the case study are robust and complicated individuals; in many cases, these people’s health and welfare are in the balance. It is true that the student decisions do not change the outcomes, but they often provide glimpses of how options turned out for these real people. This allows students to see the actual ramifications that some of the decisions led to; ideally this can instill in students the costs that some decisions have for the participants.

It is my contention that the humanities could benefit by using case studies more, if the model for the use of case studies was reframed. The use of case studies by Engineering and health science has direct benefits that can be preserved. However, this experiential learning approach to case studies may not be appropriate for the humanities. There are many potential benefits that can be enhanced by shifting away from the hands-on paradigm to an alternative model. The model I propose comes from the idea of the natural philosophy experiment. This approach is the traditional thought experiment in philosophy. The instructor proposes a short, but complicated scenario and asks students to provide possible solutions to the scenario. A classic example of this type of thought experiment is to ask students: “Can you provide a solid argument for why you know that you are awake right now, and not still asleep in your bed dreaming this conversation?” These scenarios have two pedagogical advantages. First, they force students to take a position and defend that position. These types of scenarios allow all students the opportunity to participate, whether they have read or not and whether they understand the rest of the course material or not. This occurs in a classroom environment, where the risks involved in a wrong answer are low and potential for group contributions are high.

The second advantage that natural philosophy experiments have is less obvious; they have the ability to test the consistency of students’ thoughts. The thought experiments are constructed and controlled by the instructor. This means that the instructor has the flexibility to change parts of the scenario to challenge the students’ initial arguments. If a student argues that it is acceptable for a person to steal a loaf of bread to feed her starving family, the instructor can change the scenario to not be about theft of bread but the theft (and reselling) of illegal drugs. Any changes to the scenario are at the discretion of the instructor. Any changes in the way that a student argues his or her position can be highlighted and explored. The ideal situation exposes our unstated assumptions, the contradictions in our thinking, and any conclusions that are obscured by our own biases.

This approach to the use of thought experiments has been challenged in a variety of different ways. One of the strongest critics of this approach comes from the field of feminist ethics. Carol Gillian has used criticisms of this approach as the basis for her argument against traditional models of ethics. There are several criticisms that are leveled at this method. It is argued that these scenarios are too removed from people’s actual lives. The scenarios are presented in such abstract ways that the options do not seem real; it is rare for a person to have no other option than to steal a loaf of bread in order to keep her family from starving. The second criticism is that these types of scenarios privilege thought-patterns that move from abstract principle to concrete case, but not from concrete case to abstract principle. Students tend to get positive feedback when they start with a principle (like stealing harms innocent people) and progress to the case where the principle is applied (this is a case of stealing, so it is wrong).

By rethinking the way that case studies are used in the humanities, I believe it may be possible to maintain the advantages of the Engineering and Health Sciences use of case studies and the advantages of the natural philosophy experiment, but also avoid their limitations. Both the case study and the natural philosophy experiment move students from spectators to participants. Their value is primarily in encouraging students to actually engage in the decision-making processes, rather than just comment on the mistakes made by other people. Both of these methods allow students to explore their attitudes and assumptions in closed, safe environments. There are limited risks involved and the actual scenarios are created for a purpose and carefully controlled by the instructors. The second and third advantages of the ways that Engineering and health sciences use of case studies  seem missing from the use of natural philosophy thought experiments in the humanities.

This does not have to be the case, though. If we use case studies the same way that thought experiments are traditionally used, we can keep the advantages of both approaches to student learning. Instead of using short and direct thought experiments, there are advantages to using complex, dense, and real-live case studies. This does force instructors to give up control over how the discussions will progress, but this trade-off comes with many benefits. By using a case study as the basis of the thought experiment, we maintain all of the richness of details. This, in turn, requires that students be able to discriminate between the relevant and the irrelevant. It allows students to see the real world implications of some of the decisions. This combination also avoids the problems within natural philosophy experiments. First, the cases are not abstract, they are based in real people’s experiences. Second, the complex richness of the details avoids biasing the activity toward students who more easily work from abstract principles to concrete cases; instead, students who work from the particular to the universal have as much to work with as those who work from the universal to the particular.

Anxiety over Millennials

Michael Beltz, Department of Philosophy & Religion, University of North Dakota

Much of the recent discourse about higher education has become dominated by an anxiety over whether the modern university system is properly preparing Millennial students for the modern workforce. The two most recent examples of this anxiety have been presented in opinion pieces in major national news organizations. Kathleen Parker, in the Washington Post, opined that the university system is too focused on coddling students and is graduating them without the necessary skills employers need. Much of the attention this article received focused on universities that have spent money upgrading student housing and extracurricular facilities in order to entice students to those universities (as opposed to spending those resources on providing useful skills to the students). Jeffrey Selingo, in The Chronicle of Higher Education, makes the claim that the entire educational process, from kindergarten to the end of college develops ‘one-dimensional students’ who lack flexibility and creativity, which are the key to future jobs. Each of these arguments has merit, but I think they need to be viewed in a broader context.

There is a distinct generational anxiety that shines through these two articles, the practices being criticized, and the larger discourse about the future of the United States. At its heart, this conversation has a deep concern about whether the Millennial students are significantly different from previous generations of college students. This anxiety is presented in many different ways. It is at the heart of discussions regarding helicopter parents, students who have never done research in a library and get information from the Internet, the ease of online cheating, students who need constant praise because they received (meaningless) participation metals growing up, the lack of activism by college students, and even the amount of time students devote to social activities instead of studying. This level of anxiety over Millennials as college students can be most easily seen in the number of sessions at the most recent Teaching Professor conference dedicated to providing college instructors with an understanding of the worldviews and needs of current students (seven sessions in 2011, compared to two sessions in 2009).

The core question that we seem to be facing is: Are Millennials different from previous generations of college students?

On one level, the answer to this question is obviously in the affirmative. Traditional age college students today are different from previous cohorts of college students. A first-year student in 2011 was in early elementary school on September 11, 2001. They have spent their entire lives with the World Wide Web. They were tested throughout their careers under the standards established by No Child Left Behind. They have only been alive during three presidential administrations. These are just a few of the differences that make Millennial students different from their professors.

On a different level, it is unclear whether Millennials are that much different from any previous generation of college students. As Gertrude Stein claimed: “A difference, to be a difference, must make a difference.” The key question is: do the different features of the current cohort of college students actually make a meaningful difference? At any juncture in the history of higher education, we could point to unique and contingent factors that make students different from their instructors. This does not make each of these unique features a true difference, in Stein’s sense. Consider the concern over the use of the Internet in research, as opposed to using the library. Is there a meaningful difference? Today’s students have a different source of information than their instructors had at their disposal. But this does not mean there is a meaningful educational difference. The purpose of research projects has always been fivefold: 1) teach students to develop a research project; 2) help students develop a level of understanding on a topic that has depth, rather than breadth; 3) encourage students to formulate a complex argument; 4) encourage students to engage multiple sources to synthesize an understanding of the complexity of the subject; and, 5) teach students to evaluate the quality of multiple sources to determine the strengths and weaknesses. These goals seem independent of the location where the student finds the sources. The fact that it is easier for current students to have multiple sources at their fingertips does not seem to be a real difference. The educational goals are exactly the same.

This does not mean that all of the unique features of Millennial students are irrelevant to the core goals and missions of higher education. During his keynote address at the Reflecting on Teaching Conference, at the University of North Dakota, Ken O’Donnell presented a demographic look at the future of higher education. He directly connected how differences within current, and future, college students do have significant difference on the goals of higher education. He stressed the increased number of first-generation college students, the racial make-up differences, and high rate of college transfers within the current cohort of college students. These differences, he argued, do make a difference in the missions of universities. They make a difference because they have an impact on the dropout rate of these groups and the preparedness of incoming students. Each of these differences challenges the current effectiveness of traditional models of teaching and learning. For a more details on these points, please see the coverage of his keynote address.

The task of educators needs to be determining which differences are meaningful differences. We need to be careful in how we understand the characteristics of Millennials. We need to avoid placing too much emphasis on contingent differences that are superficial to the goals of higher education; we need to avoid complaining that students’ attitudes, behaviors, demands, etc. are so much worse now because they are different from past students or different from how we experienced college. Perhaps we need to ask ourselves, as instructors, do our expectations for student learning match students’ expectations for what they want in a college degree? Do we need to alter our own perspectives on what we are hoping students will gain from their college experience? If this type of reassessment is what’s needed, we should carefully ferret out which of the differences actually need to be addressed in order for Millennials to attain the skills they need for the modern workforce.

Reflecting on Teaching Colloquium Session 3B: Teaching Empathy and Moral Thinking

The first afternoon session that I am attending is on ways to teach emotional reactions and thinking. This seems to be a controversial subject to teach, since moral reasoning is often taken to be a subject that is intuitive rather than teachable.

Renee Mabey, Meridee Danks, and Thomas Mohr (Physical Therapy), “Measurement of Moral Reasoning Skills of Physical Therapy Students”

Physical therapy developed a outcome based scores on moral reasoning and empathy. This tested 4 distinct areas of moral skills: Moral sensitivity, moral reasoning, moral motivation, and moral character.

These tests focus on evaluating the progress of moral development within pre-professional students. This progression moves from lover levels of moral development to higher levels. The lowest level of moral reasoning focuses on personal interests. The middle level focuses on moral norms and adhering to standard professional practices. The third, and highest, level is post-conventional; it has a social contract component, but it also involves basic moral rights.

What is the level of moral reasoning of students in PT at UND and across North Dakota universities, upper Midwest doctoral programs, and national levels? Students were given five scenarios and asked to rank moral concerns, importance, and focus. Students at UND fall within national averages. They also show progress over three years, which is atypical of the upper Midwest doctoral programs.

Patti Alleva, (Legal Education), “Through A Meta, Micro, and Marco Frame: Teaching to Empathy and Open-mindedness”

Thesis: Empathy can be taught through the transformative power of literature coupled with targeted strategies that will help law students to explore three things: (1) Who they are as professionals and people (the Meta), (2) their immediate professional relationships with others, especially clients (the Mirco), and (3) their extended relationships with society at large (the Macro).

Why is teaching empathy valuable?

1) Lawyers work for clients, so lawyers need to be able to see the world through their clients’ eyes. 2) Lawyers are problem-solvers. 3) Lawyers are translators. Empathy promotes good practices and effective translation of cleint needs and goals.

How can we teach empathy?

The proposed solution focuses on literature in addition to direct problem solving. This involves teaching to self-consciousness and an awareness of ourselves, teaching to other-consciousness, and developing the humility of open-mindedness.

Literature matters because it provides characters and situations in realistic ways. It presents different world-views on an emotional level. It provides diverse perspectives and emotions. This is the core feature of empathy. Good literature can spur self evaluation of beliefs. Finally, literature takes us places that we normally cannot be (for example, inside the minds of characters at the point they are making decisions).


Literature by itself is beneficial, but it is most valuable when it is coupled with discussion. These group discussions force students to defend their positions, be open-minded to other perspectives, and listen to classmates presenting alternative perspectives.

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Conversation:

How do we measure values? How can we measure growth in empathy? Does the emphasis on literature presuppose a trust of the students’ ability to read texts in standard (or accurate) ways?

Reflecting on Teaching Colloquium Session: Keynote Address

The keynote address for the Reflecting on Teaching Conference focuses on the future of higher education. With a broader and more diverse student body population, how will university systems change to current demographic trends.

Ken O’Donnell, Associate Dean of Academic Programs, California State University Office of the Chancellor, “The Finish Line”

What is the experience of college for students who are just entering school and might not be sure that they should be here? Students have a mythology that a college degree will lead them to wealth, so they select degrees that sound like a job. As they progress through school they see the focus on pre-professional training less important than ‘the book learning.’ We need to help them see an enrichment between both a professional focus and an influence over their own lives. That focus is the goal (not money); that is the finish line.
If we cannot sell students on the substance of he value of our classes (and higher education, in general), then students drop out. This is a major issue now because we are not teaching a small sliver of the population (the educated elite).  This is no longer a institution for the elite or those people that come from a family tradition of education (those that do not need to be sold on the value of higher education).

Students come from a broader background. There is a higher percentage of non-white ethnic populations in higher education. There is a higher percentage of students whose parents did not attend college. Both of these trends appear to be the tip of the iceberg for the future of higher education, given national demographic trends.

This poses unique challenges for higher education because different groups have different traditions of preparedness for higher education. We will have more students on the extremes of preparedness in the classroom: more students that are hyper-prepared and more students that are under-prepared.


What does General Education (GE) do for students and the university? What are the unique benefits of GE? 1) It is a welcome mat. These first classes hook students into the value of education. 2) It has unique reach; these are the classes that are the one universal for all students across the state. 3) There are good learning it them. The list given by employers tend to focus on the skills and emphases that are focused on in GE.

There is a gap between the goals and advantages of GE and what we actually have in GE. Limiting this gap will keep students engaged and in higher education. High Impact Practices can help us do with (like study abroad, research with faculty, internships, students teaching each other, capstone, etc). These have a persistence value for all students, but especially for high risk students.

How do we strengthen engagement while accommodating mobility? 1) Embed High Impact Practices in as many courses as possible. 2) Articulate High Impact Practices for each degree, not for each course. 3) Finding midpoint proficiencies and outcomes and making sure students stay at that level. 4) Put students attention on the finish line; not just monetary benefits, but overall happiness and civil engagement.

Ken O’Donnell’s blog: diffusionoflight.wordpress.com
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Conversation:

Where is the quality control for transfer students? You need constant conversations and attention. How much of the High Impact Practices occur at community colleges? Is the research on High Impact Practices biased by self-selection?