Implementing and Assessing Computer-Based Active Learning Materials In Introductory Thermodynamics
Edward E. Anderson1, Roman Taraban2, and M.P. Sharma3
1Department of Mechanical Engineering
2Department of Psychology
Texas Tech University
Lubbock, TX 79409
3Department of Chemical Engineering
University of Wyoming
Laramie, WY 82071-3295
Students learn and retain more as they become increasingly engaged with instructional materials. We describe active-learning teaching methods that we used to develop computer-based instruction modules for introductory thermodynamics. These methods, which can be generalized to other topics in engineering, include the use of interactive exercises, immediate feedback, graphical modeling, physical world simulation, and exploration. Ongoing assessment of the effectiveness of these materials has been carried out in parallel with development, in part, to assure that students have access to the required technology and sufficient time outside of class to use the materials. The assessment data include behavioral and cognitive variables that were used to examine the usability and impact of the computer modules.
It is well known that students learn and retain more as they become more engaged with instructional materials. Reisman and Carr  concluded that students learn 20% of the material taught by hearing, 40% by seeing and hearing, and 75% by seeing, hearing, and doing. Well-designed computer-based-instruction (CBI) modules offer the possibility of achieving the 75% goal through multi-media presentation formats and student interactions. Attitudes towards interactive materials have been positive. Renshaw et al. , for instance, stated that “students unanimously preferred modules that incorporated animations and interactive design tools.” Others [2 - 7] have reported similar findings in several engineering fields and topics. We believe that a current challenge in engineering education is to develop active learning exercises that are simple, relate to the learner’s experience level, and that can be incorporated into and synchronized with other teaching pedagogies. The materials need to be structured so that learners can proceed at their own pace, receive appropriate feedback and coaching, and can review as often as necessary to achieve mastery.
A related challenge is to assure that instructional materials are useable, and that they make a difference in learning. There are several reasons why assessment must be part of the development of new materials and pedagogical methods. As teachers are well aware, there are broad differences in background knowledge, ability, and interests in the students who register for their courses. Teachers, as well, incorporate a broad range of practices into course development and delivery. Finally, there is no “science” of teaching that can guarantee definite results. Therefore, it is imprudent to assume that instructional modules, labs, and other materials will help students learn simply because the teacher has made the materials available to students.
The first part of this paper presents and discusses several kinds of interactions and exercises that have been integrated with a complete CBI system and textbook  covering the topics listed in Table 1. These include
· content pages with narrative voice-overs and clickable figures and animations
· interactive questions
· short-response interactions
· coaching interactions
· and experimental simulations.
The examples that are presented were taken from the Introduction to Thermodynamics course that is taught to almost every engineering and technology student. This course is particularly challenging because it is normally taught without a laboratory experience. It also contains many physical concepts that are unfamiliar to students. Most of these are easily observed with simple experiments that can be simulated by a computer. Therefore, this course is well suited to the use of active learning techniques that are integrated with the static elements of the course.
· Basic properties: pressure, temperature, density, internal energy, entropy, and enthalpy
· Equations of state, specific heats, phase conversion, and tables of properties
· Thermodynamic systems, process, work, and heat concepts
· Conservation of energy for closed, steady-state, and transient systems
· Second law of thermodynamics, entropy, and the consequences of the second law
· Exergy and entropy concepts, and balances
· Application of the thermodynamic principles to basic reciprocating-piston engines, gas turbines, electrical power generation, refrigerators, and heat pumps
Table 1 – Introduction to Thermodynamics Topics Covered in CBI Modules
The second part of the paper outlines the multi-faceted approach that we are using to assess the usability, quality, and impact of these materials on student learning at Texas Tech University (TTU) and the University of Wyoming (UWyo). These include
· assessment of the technological needs and challenges posed to students using the materials
· estimating the amount of time students spend on the supplemental materials in the context of the time spent on the course in general
· detailed analysis of how students navigate through the computer-based materials
· detailed analysis of how students think about the concepts and the media
· and the impact of using these materials on mastery of the course material.
Measurement of the impact of CBI on knowledge gained provides a gauge that developers can use to improve or discard marginal exercises and retain successful ones. Measuring the changes in the knowledge states of students should ultimately allow us to assist those who begin a course with varying and perhaps inadequate knowledge backgrounds, who interrupt or modify course sequences, or who short-circuit or perform poorly in prerequisite courses. Finally, it is important to assist students in the transition from low-risk, low-investment learners to self-paced, lifelong learners. To achieve this, it is necessary to develop the means and methods to measure these changes and to tailor learning materials to contribute to the accomplishment of this goal.
II. ACTIVE LEARNING EXAMPLES
A. Content Pages with Narrative Voice-Overs and Clickable Figures and Animations
Approximately two-thirds of the instructional material consists of text and graphics pages with audio voice-overs. These are designed to present the material in a succinct and compact form for the learner. A typical screen of this type is presented in Figure 1.
Figure 1 – Typical Content Page
Many of these
screens contain cursor-over pop-ups to display additional graphics or
information about the topic. For example, dragging the cursor over the
turbine building of Figure 1 causes an interior view of the turbine floor to
appear. All screens contain an “additional
information” button which when clicked causes additional textual information to
appear. The purpose of this feature is
to address the learning needs of those students who need to explore the topic
deeply than is possible through the
initial narrative and displayed information.
Many of these pop-ups also contain links to additional web pages that go
even deeper into the topic. This
layering of depth of topic coverage is provided to allow the users to explore
each topic to the extent they feel is sufficient to reach their
B. Interactive Questions
The simplest active learning exercise to implement in a CBI module is the interactive question that usually takes the form of a multiple-choice or short-answer question. Both of these formats are easily graded and immediate feedback based upon the user’s answer is readily programmed into the module. They also serve to interrupt passive learning, which occurs as students read static text or listen to lectures. This interruption resets the student learning effectiveness to a higher level [9, 10] thereby improving mastery and retention of the material.
An example of this type of
active exercise is shown in Figure
2.2 This particular exercise was taken from one
of the modules developed for this project.
This exercise is basically a multiple-choice question which is to be
answered by dragging the equation for the volume of an object onto the correct
object, which in this example is the triangular prism. This exercise appears following a brief
lecture on extensive and intensive properties, and the system volume
property. Its purpose is twofold: to
reinforce the concept of volume as an extensive property and to remind students
that they are responsible for knowledge acquired in previous courses. If the student drags the equation onto the
wrong figure, the equation returns to its original position as a visual means
of coaching the student.
22 – Multiple Choice Interaction
This particular example follows three screens of popup text synchronized with an audio voice-over. These screens are included with the interactive version of this paper. Although the placing of exercises such as this is subject to the material being taught and the objectives of that material, their purpose is defeated if they are too infrequent. It is suggested that they be placed no more than 2-4 screens apart to keep students actively engaged with the material.
C. Short Response Interactions
interactions are also known as short-answer questions when the student enters
text to answer a question. Engineering
and the physical sciences often don’t use text as a short response, but rather
use digits, symbols, or equations for the short answer. These forms of input can be cumbersome in
view of the limitations of the computer keyboard. An alternative means of executing a short response input is
presented in Figure
This exercise begins by presenting the textual material shown on the
left-hand-side of the screen, which summarizes the definition of pressure. The user is then asked to determine the
amount of weight that must be placed upon the piston to generate a certain
pressure in the piston-cylinder contents.
The target pressure is a randomly generated number and users are expected
to do an off-line calculation to determine the required weight. The user then proceeds to drag weights onto
the piston until the proper amount of weight has been added to achieve the
desired pressure. Each time a new
weight is added to the piston, the pressure gauge indicates the new pressure.
33 – Short
Response Interaction Example
This rather simple exercise demonstrates many of the features found in well-designed CBI learning modules. It states the objective, engages the user, allows the user to explore and discover, correlates the information with other sources, provides feedback, may require iteration, and takes advantage of the features found in CBI that are not available in static media. As with the proceeding example, this exercise follows a brief lecture on pressure, which is included with the interactive version of this paper.
D. Coaching Interactions
Student coaching interactions actively engage students in the learning process and allow them to discover knowledge and thereby retain that knowledge. Although coaching is most commonly used with exercises that provide feedback when the student completes the exercise, it can be accomplished in other ways.
44 – Coaching Interaction Example
An example of an alternate
application of coaching in this project is shown in Figure
4.4 This application encourages the student to
explore the various terms of the equation on the right-hand-side of the screen
by dragging the cursor over the terms.
Once the cursor is over a specific equation term, a coaching message,
like that shown in Figure 44, appears. The first law of thermodynamics has been thoroughly discussed
using pop-up text synchronized with voice-overs in the screens preceding this
exercise, as demonstrated in the interactive form of this paper. These coaching messages then serve to
reinforce the previous presentations.
In addition to repeating the information and reinforcing it, these coaching messages serve to engage the visual learner rather than the audio learner who was engaged during the preceding screens. One of the principal benefits of CBI is that it can accommodate many different learning styles. Instructional developers should always take advantage of this benefit and use it to actively engage the various learning styles.
E. Experimental Simulations
of actively engaging students with the material is to have them perform
simulations of physical experiments.
The simulation shown in Figure
demonstrates liquid-vapor phase conversion as a substance undergoes a constant
pressure heating process. During this
conversion experiment, temperature-time and volume-time data are recorded and
plotted. The initial screen for this simulation
is presented in Figure 5.5
55 – Experimental Simulation
The experiment is performed
in the piston-cylinder device shown in Figure
5.5 As heat is transferred from the flames to
the water in the piston-cylinder device, students can observe the relative
amount of liquid and vapor, the total volume of the liquid-vapor mixture, the
temperature of this mixture, and a plot recording the system volume as time
passes. This plot is synchronized with
the location of the piston. Students
run this experiment at three different pressures by clicking on the appropriate
buttons. The final results of this
experiment are shown in the data plot of Figure 55.
Although students in introductory thermodynamics courses have a general concept of phases—basically, solid, liquid, and gaseous—they don’t have the depth of understanding of phases required for thermodynamic analysis. Phase conversion and the effect of the pressure upon the conversion is a difficult concept to grasp from static descriptive materials. Historically, this concept was experienced in laboratory experiments or physical demonstrations, typically in chemistry or physics lectures. For the most part, this is no longer done.
This simulation may actually be preferred to a similar physical experiment. In the laboratory, it is difficult to physically create equilibrium, heat transfer and transient effects make it difficult to observe the points of volume-time slope discontinuity, transparent cylinders typically fog up, thereby limiting the visibility of the process, and students lose learning time as they are trained in the operation of the equipment.
Experimental Simulation Conclusion Screen
The screen immediately
55 is shown in Figure 6.6 The purpose of this screen is to begin the
development of the concept of phase diagrams.
The concept of a saturation line and of areas bounded by saturation
lines representing the states at which different phases of the fluid occur are
demonstrated in this screen. An audio
voice-over that presents an additional explanation of the concepts shown in
this figure accompanies this screen.
The volume-time behavior of this experiment is the second in the set of experiments performed by the student. The results of both experiments are then used to develop the pressure-specific volume state diagram by cross-plotting the results. Student comments have indicated that they have a better appreciation of the pressure-specific volume-state diagram and its application to state determination and analysis as a result of these virtual experiments.
III. ASSESSMENT METHODS
A. Availability and Usability of Technology
As we began introducing the CBI materials into the thermodynamics courses in the form of a CD-ROM, we addressed student preparedness for these materials through the use of questionnaires . A large percentage of the students indicated that they owned computers with Internet access (TTU - 85% and UWyo - 78%). An even larger percentage claimed to own computers with CD-ROM drives (TTU - 92% and UWyo -87%). When asked to rate their computer skills, many, but not all students, rated their skills as high (TTU: high - 58%, medium - 42%, and low - 0%; UWyo: high - 57%, medium - 39%, low - 4%). Students were also asked if they had used CD-ROM-based instruction in other classes. Only about half the students had been exposed to this form of instruction (TTU: 54%; UWyo: 44%). Generally, these percentages were encouraging, but cumulatively, they indicated several potential sources of difficulty that students could face in accessing and using the CD-ROM resources that we were implementing in these classes. Some of these problems could be addressed by directing students to university facilities, but others had to be addressed directly by the instructors when revising and delivering the course materials.
At the University of Wyoming, the questionnaire data were supplemented by structured personal interviews at the end of the course . Early on, up to 80% of the students indicated that they had technical problems with the CD-ROMs. Students also suggested that the frustrations generated by technical difficulties tended to make the CD-ROM less relevant to meeting the goals of the course. Our findings are consistent with others who have observed the impact of technology failures upon user satisfaction and perception of value . The interview data were important early in development in focusing attention on the technical difficulties, albeit sometimes minor, that discouraged students from using the materials.
B. Time Students Allocated to Learning Resources
A second set of
measures that we used in implementing the CD-ROM materials consisted of
estimates of the amount of time students spent on course materials . The rationale for an interest in knowing
about all of the students’ study activities was the recognition that the CBI
materials that we developed were part of a larger picture, and that some
understanding of typical student study behaviors was necessary in order to
understand how the CBI materials might fit into the curriculum as a whole. Through daily logs, which students used to keep a record of behaviors
associated with the thermodynamics classes, we learned that the mean class
attendance per week was 2.07 hours
[standard deviation (SD) = 1.05], and mean study time was
6.91 hours (SD = 3.96), the latter exceeding the standard
expectation of two hours of study outside of class for each credit hour
(Introduction to Thermodynamics is a three-credit course). The dominant activities were attending
lectures and doing textbook homework problems, accounting for nearly half of
the total time spent by students on this
course. In a sample of 211 students, over
a span of three semesters, the average time spent using the CD-ROM materials
was 0.23 hours (SD = 0.63) – i.e., less than 15 minutes per week! These data showed that students allocated a
significant amount of time to this course, and that increasing the levels of students’
engagement with CBI materials would require adjusting other demands that were
being made of them, primarily assigned textbook problems.
C. Navigation Patterns Through the CD-ROM Modules
About two-thirds of the CD-ROM screens
consist of expository text. Nearly all screens begin with a narrative
voice-over. The other one-third of the
s interactions that require the
student to respond in meaningful ways. In
two case studies , we examined the times that students spent on different
components of the CD-ROM materials, and how they proceeded through the
materials. This was accomplished through the use of audit trails , which are records of all the responses students
make as they work through CBI materials. By summarizing and analyzing the audit trails, we were able to
ascertain how students progressed through the CBI materials, click-by-click, page-by-page,
The results that are described next are based on a sample of 31 students, which consists of 70% of the enrolled students in an intact course. The students spent about 30% of their total screen times listening to the narrations. The remaining 70% of the time was spent examining the text and figures and engaging the interactive elements. On average, students spent 31 seconds on screens without interactive elements, 46 seconds on pages with interactive elements, and 52 seconds on quiz pages. Overall, these data indicated that students were using these materials as the instructor intended. They continued to explore and process the materials on the pages long after the narration ended, and they devoted greater time to those pages that required active interaction on their part.
Figure 7 provides a summary of students’ moves through the CD-ROM screens. These results are typical of those from other cohorts of students that we have tested. The figure shows that after finishing a page, students typically went to the next page (92.6%), using either the next page button (76.0%) or by going through the Table of Contents (TOC) (16.6%) for that section of the module. (Typically, students went to the TOC when they reached the last page of a section.) Other researchers have observed this linear usage pattern for other forms of CBI . In ongoing research, we are striving to determine the ways in which moving forward one page is an adaptive form of navigation given the nature of the learning materials, students’ background knowledge, students’ perceptions of the learning task, and students’ learning goals, and to what extent it reflects limitations in the software or metacognitive strategies of the user. It is well known that
Figure 7 - Analysis of User Navigational Patterns
successful college readers form specific reading goals, and look back and jump forward while reading in order to achieve those reading goals . Because these are explicit and intentional behaviors about cognitive processing, they are labeled meta-cognitive. Through the selection and application of metacognitive strategies, the reader monitors and guides comprehension. The navigation patterns in our data did not indicate very much metacognitive processing
D. How Students Think About the Concepts and the Media
In order to gain insight into students’ cognitive processes as they worked through the CD-ROM materials, we collected “think aloud” protocols  as student volunteers worked through portions of the CD-ROM. In the think-aloud method, students are asked simply to report what they are thinking as they process the materials, without attempting to interpret or summarize the materials for the experimenter, unless those interpretations or summaries are a natural part of their thought processes. The data are collected one person at a time, and are tape-recorded for later transcription. During data collection, the primary role of the experimenter is to prompt the student regularly to continue to verbalize his or her thoughts. Following the think-aloud session, participants completed several open-ended and forced-choice questions.
The 20 participants in this study produced a total of
1327 verbalizations, at a rate of about 1.66 verbalizations per minute. Eighty-two percent of the comments that
participants made were about comprehending the text. Only 14% of the comments
expressed comprehension difficulty. The
relatively low proportion of comments expressing confusion indicated that the
materials were comprehensible. On the
other hand, the comments that were made consisted largely of a reiteration of
the content on the screen, either through reading the text out loud, or
describing or summarizing the text, narration, a graph, or interactive
element. These findings were consistent
with those of the linear
navigation pattern described
earlier, and indicated a relatively low level of cognitive sophistication on
the part of these readers in terms of the metacognitive strategies that they
applied to understanding these science texts [18, 19]. Together, the findings
suggest that additional improvement in the impact of the CD-ROM may depend on increasing
the cognitive sophistication of the students using the materials.
In the open-ended questions, participants provided some very specific suggestions for improving the software, including the ability to turn the narration off, and including explanations for answers to questions. In the rating task, participants gave high ratings to several potential changes to the CD-ROM, including providing a search function for the entire CD-ROM, and including a subject index. Students responses to these questions were consistent with the high percentage of comprehension-related verbalizations described earlier, and indicated that students were engaged with the materials and that they were active processors, not passive processors.
E. The Impact the CD-ROM on Course Mastery
Whether course materials, assignments, and other activities have an impact on student learning must become a central concern in assessment. Students have limited time for academics . As educators, we must search for the means of making students’ use of time efficient and productive.
In the research involving study logs  described earlier, the five most frequently reported learning activities were attending lecture, solving textbook problems, completing on-line homework problems, reading the textbook, and using the CD-ROM. In a sample of 61 students representing an intact class, the time that students reported using the CD-ROM was positively correlated with the time students spent using the other learning resources. CD-ROM times were also positively correlated with students’ test average for the course. Due in part to the small sample size, only the correlation of CD-ROM times and on-line homework times was statistically significant. In the future, we hope to confirm the general pattern of mutual support in the use of learning resources (e.g., using the CD-ROM and the textbook), as well as the positive contribution of CD-ROM use to course performance, as measured objectively by indicators like test grades.
In this paper we illustrated the application of active learning techniques to CBI learning modules for a typical engineering Introduction to Thermodynamics course. These techniques are but a small set of many possibilities, and the final set of Introduction to Thermodynamics modules contains several others. Interested readers may view these at www7.tltlc.ttu.edu/thermotutoril. The set presented in this paper was selected specifically to demonstrate alternative ways of asking multiple-choice and short answer questions, because many teachers feel that these formats are too restrictive for science and engineering purposes. These interactive questions, as well as clickable figures and animations, and narrative voice-overs, are representative of the various tools that are available to contemporary curriculum developers to engage students in their own learning processes.
We also described the ongoing application of a set of
complementary assessment methods that were applied to this project, consistent
with our assumption that simply developing good computer-based instructional
materials will not be sufficient in guaranteeing their usability and impact on
student learning. The data suggested
that most students were prepared to use computer-based instruction—i.e., they
had access to computers and were skilled in the use of computers—but even minor
technical problems were sufficiently frustrating to discourage students from
using the CD-ROM materials. The use of
audit trails indicated that, in general, students used the materials as
intended by the instructor, dwelling longer on those pages that required
student interactions. The audit trails furthered showed that these students
were linear learners in the context of using these materials. Other research has indicated that non-linear text processing patterns
typify expert college readers, thus the linear pattern raises some concern
about the metacognitive processing applied to comprehending the CD-ROM
materials. There was no evidence in an
independent set of data to indicate that students
the material in a deep fashion, as would be indicated by more metacognitive
comments—e.g., raising questions, making predictions, constructing inferences,
and evaluating the content. In spite of
these limitations, correlations between time spent using the CD-ROM, the use of
other learning resources, and test performance, have been positive, in the data
reported here and elsewhere , indicating that the CD-ROM was a useful
learning resource for introductory thermodynamics students.
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EDWARD E. ANDERSON
Edward E. Anderson is Professor of Mechanical Engineering at Texas Tech University where he is also the Associate Director of the University Teaching, Learning, and Technology Center. His responsibilities at the Center are to train and assist faculty throughout the university in applying technology to their teaching. He received his Ph.D. degree from Purdue University. Recently, he has produced 7 CBI textbook supplements covering topics ranging from electrical circuits to thermodynamics as well as the Fundamentals of Engineering examination.
Roman Taraban is Associate Professor in the Department of Psychology at Texas Tech University. He received his Ph.D. in cognitive psychology from Carnegie Mellon University. His interests are in how undergraduate students learn, and especially, how they draw meaningful connections in traditional college content materials (e.g., textbooks, lectures, multi-media).
M.P. Sharma is Professor of Chemical and Petroleum Engineering at the University of Wyoming. He received his Ph.D. degree in Mechanical Engineering from Washington State University. A current area of interest is conducting research on teaching and learning methods. He has developed an online course for Engineering Thermodynamics that is fully deliverable by Internet to remote and on-campus students. He has been teaching this course as he continues to conduct research and development of it.
This project was sponsored by the U.S. National Science Foundation under CCLI grant 0089410.