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ELECTRONIC RESOURCES |
* Department of Biology, CB No. 3280, Coker Hall,
010A, and School of Journalism and Mass
Communication, University of North Carolina at Chapel Hill, Chapel Hill, North
Carolina 27599–3365
Submitted August 13, 2002; Revised November 15, 2002; Accepted November 19, 2002
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ABSTRACT |
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 TOP ABSTRACT INTRODUCTIONTOPIC, MODULE, PEDAGOGY, AND...FEEDBACK ON MODULE DESIGNFEEDBACK FINDINGSMODULE REVISIONSDISCUSSIONREFERENCES |
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Key Words: undergraduate • cancer • module • constructivism • interactive multimedia
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INTRODUCTION |
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TOPABSTRACTINTRODUCTIONTOPIC, MODULE, PEDAGOGY, AND...FEEDBACK ON MODULE DESIGNFEEDBACK FINDINGSMODULE REVISIONSDISCUSSIONREFERENCES |
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Multimedia is becoming an important tool for faculty in the biological sciences due to increasing conceptual and functional complexity that presents educational challenges that cannot be adequately addressed with traditional teaching methods (Buckley et al., 1999). Further, multimedia-based laboratory modules allow students to conduct experiments and experience interactive learning that would otherwise not be possible due to the complexity of the topic, laboratory hazards, cost, and/or ethical dilemmas; for example, at the undergraduate level, computer simulations have replaced some dissection laboratories (Watanabe, 2002). For educating medical and health professionals, many schools have explored drill and practice training (Boudinot and Martin, 2001; Wilson and Mires, 2001) and problem-based modules (Kennedy et al., 2001; Keppell et al., 2001) as ways to improve learning. Recently, multimedia has been utilized to allow students to control real laboratory equipment from a distance, for example, scanning probe microscopes (Razdan et al., 2000) and chemical reactions (Senese et al., 2000). In general, though, lab-based multimedia such as tutorials, simulations, and problem-based modules have been used to supplement traditional laboratories and provide "hands-on" opportunities in courses where laboratories are not feasible, such as in distance education courses.
Given the variety of multimedia tools and design possibilities, there are a number of ways to design instructional multimedia to advance learning. Many principles have been identified for effective learning and overall design, including instructional, interactive, interface, and usability design (Brittain et al., 1998; Gagné et al., 1992; Graham, 1999; Head, 1999; Hunt, 1998; Lavoie, 1995; Lee and Owens, 2000; Mandel, 1997; Mayer, 2002; Soulier, 1988). Here we describe the design and development of Cancer Cell Biology (West and Bockholt, 2000, 2002), an interactive multimedia, problem-based module with the goal of bridging concepts between basic experimental techniques and underlying factors that govern the cell biological principles involved in the development of cancer.
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TOPIC, MODULE, PEDAGOGY, AND TECHNICAL DESIGNS |
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TOPABSTRACTINTRODUCTIONTOPIC, MODULE, PEDAGOGY, AND...FEEDBACK ON MODULE DESIGNFEEDBACK FINDINGSMODULE REVISIONSDISCUSSIONREFERENCES |
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Topic Design
In developing a module, we wanted to identify a topic that was conceptually
challenging and relevant to pique student interest. Oncogenesis, which
encompasses the disciplines of cell biology, molecular biology, and genetics,
was selected because it is an integrated field and because it is a disease
state that directly or indirectly touches us all. Further, cancer exemplifies
the importance of maintaining the complex interactions of biological systems
and readily illustrates the ramifications if altered.
Cancer arises from a series of mutations in genes that regulate normal cell behavior. The classical example is mutations in tumor suppressor genes and protooncogenes, which result in the disruption of normal cell cycle regulation, giving rise to uncontrolled cell growth. Given the general understanding of the impact of these mutations, they were selected to be the focus of this cancer module. The overall objective is for students to relate concepts of how cells behave in different assays with basic concepts of what is occurring at the molecular level to lead to the development of cancer. Specifically, the educational objectives are for students to be able 1) to gather data from five basic assays as needed, including Western blot, immunofluorescence staining, protein inhibition, gene transfer, and apoptosis; 2) to distinguish between oncogenes and tumor suppressor genes; 3) to identify the location of the mutation in either the coding or the regulatory regions of a gene; 4) to identify the function of a particular protein; and 5) to describe how the mutation of a gene results in changes in the function of its protein and, ultimately, cell behavior. The goal was to design a module to address these objectives and experimental techniques that could be completed in about an hour, depending upon a student's background. Thus, it was necessary to limit and greatly simplify the problem to the analysis of a single-gene mutation in either a protooncogene or a tumor suppressor gene involved in tumor cell growth.
Module Design
Scientific research involves the analysis of experimental evidence from
multiple sources, including data from experiments performed in the laboratory
and scientific publications. Through a process of hypothesis formulation and
testing, a scientist is able to develop an explanation for an observed
phenomenon. How this discovery process unfolds varies with a scientist's
training and knowledge base. For example, different scientists often discover
the same gene or protein beginning with different hypotheses and/or employing
different experimental approaches. Multimedia presents an opportunity to place
large numbers of students intellectually in the world of scientific research
so they can experience and learn from the scientific process in a manner that
best suits their learning styles.
Cancer Cell Biology places the student in the role of a physician/scientist with research tools to conduct experiments with the goal of identifying the mutated gene responsible for tumor cell growth in a patient. Students begin by entering their last name on the module's welcome page, which results in their being addressed throughout the module as "doctor (last name)." After choosing one of four fictitious patient cases, the student is presented with a letter containing a patient description and medical history (Figure 1). In each case, the letter also explains that the patient has had a benign tumor removed and requests the expertise of the doctor in 1) identifying which one of six protooncogenes and tumor suppressor genes (A to F) is mutated, 2) determining where the mutation is likely to have occurred, i.e., in the regulatory or coding region, and 3) identifying the function of the protein that the gene encodes. Using both tumor and control cells isolated from the patient, the doctor can employ five experimental assays to characterize the mutated gene and its protein. Figure 2 illustrates the gene transfer assay (Figure 2A) along with sample student results (Figure 2B). As needed, the doctor accesses background information on each assay (Figure 2C), as well as a short review on protooncogenes and tumor suppressor genes (Figure 3A). A pop-up window accessed by the Notes button enables students to record notes throughout the analysis process. Students are encouraged to use these notes to identify the mutated gene and complete a final report on the patient.
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Pedagogy Design
Constructivist, or inquiry-based, learning (as reviewed by
Leonard, 2000) served as the
pedagogical model for developing the module. Specifically, the 5E
instructional model (Engage, Explore, Explain, Elaborate, and Evaluate) is a
series of phases facilitated by an instructor using defined strategies to
elicit certain student behavior including engaging students with their peers
to redefine, elaborate, and change their initial concepts through
self-reflection (Bybee, 1997).
This model is cyclical, student-centered, active, and inquiry-based. While the
5E model has been established as a desired pedagogy for science learning in
the classroom and laboratory, its applications and efficacy in
multimedia-based science learning environments are not well developed. The 5E
model has been incorporated into the design of Cancer Cell Biology in
the following ways:
Concomitantly with the 5E model, we have strived to address successfully different student learning styles, e.g., sensing and intuitive, visual and verbal, sequential and global, and active and reflective, which require that dimensions of each learning style are addressed part of the time (Felder, 1993). For example, with Cancer Cell Biology, global learners can get an overview of the module and freedom to navigate to get an overall understanding, while sequential learners can use the module in a patient-by-patient and assay-by-assay format, providing them linear continuity in the learning process. Sensing learners like facts and observations, while intuitors like concepts and interpretations. Cancer Cell Biology requires that students exercise both styles of learning. We have tried to accommodate as many learning styles as possible, including the visual and verbal. Though audio capabilities are a strength of multimedia, Cancer Cell Biology is textual rather than audio-based because computers on campuses often do not have speakers, particularly those in libraries and computer labs. However, as more universities evolve from centralized computer lab support for students to mobile laptop-based environments (Chronicle of Higher Education, 2000), the use of audio will further enrich multimedia learning experiences for all students.
Technical Design
To promote accessibility, Cancer Cell Biology was developed as a
Web-based module. Consequently, fast download times and multiplatform
compatibility needed to be achieved, and this was possible using Macromedia's
(2002a) Flash 4 software.
Because Flash is a vector-based animation program, it produces small file
sizes. Further, the Flash Player that is required to play the module in a Web
browser has a high penetration rate, with 95.9% of users being able to use
Flash 4 content without having to download and install a player
(Macromedia, 2002b). In the
event that a user does not have the correct version of Flash, the module
directs them to the Macromedia site to download the most recent version.
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FEEDBACK ON MODULE DESIGN |
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Scientist/Science Educator
Regular meetings were held with multidisciplinary groups of scientists and
science educators to gather feedback on the topic, design, and construction of
the module. Prior to students evaluating the completed module, several
postdoctoral scientists also participated in providing feedback.
Undergraduate Students
Feedback was gathered formally from students participating in a survey and
informally from other classes via discussion or written critiques. Here we
describe the process in which feedback was formally solicited.
Prototype
A prototype of Cancer Cell Biology was piloted as part of a guest
lecture series in a sophomore-level course near the end of the semester by two
of the authors (Bockholt and West). The prototype consisted of a single
patient case with only the first set of report questions. After an interactive
lecture on cancer, students were given the module to explore over several days
outside of class and the opportunity to write up and submit an analysis of the
patient case for extra credit. In a subsequent class, the students completed a
questionnaire and then discussed the module's content and goals (focus group
format). The class ended with an interactive lecture on cancer treatments to
achieve closure on the topic.
Complete Module
One year after the initial feedback in the same course, with Bockholt
conducting the activity, the same process of an introductory interactive
lecture to set students up for the module was followed by another interactive
lecture and discussion session. Obtaining feedback from students involved a
signed consent to participate. For extra credit in the course, students could
either choose to participate in providing feedback via the survey or to
complete an alternative activity that involved a set of problem-based
questions on oncogenes and tumor suppressor genes to be submitted and provided
feedback via e-mail. A Web page was used to provide instructions for
completing either the Web-based module
(West and Bockholt, 2000) and
survey or the alternate assignment, with hyperlinks to each of these
activities. Students were not told how many patient cases to investigate or
how much time they were to spend on the module.
Survey Instrument
The on-line survey to gather student feedback included multiple-response
and open-ended questions. The open-ended questions were designed to identify
strengths and weaknesses in the module's design without biasing students. The
survey was created using WebCT's quiz tool and students logged in with ID
numbers and passwords. This on-line approach streamlined the survey process,
facilitated review of student responses, and enabled students to report their
experiences immediately after completing the module. To increase the
likelihood of receiving completed surveys, this on-line survey tool alerted
students to unanswered questions and provided the students an opportunity to
complete the survey before finalizing their submission.
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FEEDBACK FINDINGS |
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Complete Module
Feedback on the completed module was obtained from 24 of 30 possible
student participants—15 sophomores, 6 juniors, and 3 seniors. All of the
students elected to evaluate the Cancer Cell Biology
(West and Bockholt, 2000)
module, demonstrating student interest in multimedia. Since the activity was
performed out of class, direct observational data regarding the degree of
interactivity between students and the module were not collected. However,
based upon the specific nature of student responses to survey questions, it
was apparent that the students explored the module and succeeded at diagnosing
patient cases.
Student Engagement
The extent to which students were engaged in the module was inferred from
the time that they reported spending on the module. Twenty-three of the 24
students reported spending at least half an hour on the module. Of those, half
of the students spent at least 1 h on the module and the other half spent up
to 2.5 h. With half of the students spending an hour or more, it appears that
the module was effective at engagement.
To begin assessing the extent to which students explored the module, as well as their success, they were asked how many patients they evaluated. Fifteen students reported exploring two patients, six reported three patients, and one reported four. Only two students reported evaluating just one patient. The students were then asked how many patients they completed, determined by reaching the congratulatory screen. Three students reported completing one case, 14 reported completing two, and 1 reported completing four. Five students reported that they were unable to complete a case and one did not answer the question. With students investigating many patient cases, and over half completing two cases, these responses suggest that the students were effectively engaged in the module and able to complete a diagnosis successfully.
Overall Design
To ascertain how students viewed the module in terms that they use to
evaluate teaching and learning, they were given a list of descriptive terms to
characterize the module (Table
1). The majority of the students described the activity as
challenging and interesting, while a number of responses were also recorded
for relevant, cool, fun, intuitive, and easy to navigate.
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To gain additional information, the students were asked a series of open-ended questions about what they liked most, liked least, and would change about the module and/or wished it could do. Responses were categorized and tabulated, with representative student answers listed in Table 2. While we expected that students would like the cancer topic, the use of technology to learn, and the role play as doctor/scientist, we did not anticipate that they would like as much as they did the challenge and process of applying their knowledge and data analysis skills. Their enjoyment at conducting the experiments and being rewarded when getting the right answers was an additional unanticipated outcome. Other positive responses included the interactivity and ease of navigation. Reflecting on the culture of today's youth, the overall positive student responses to Cancer Cell Biology could be rooted in this generation growing up with video games and computers. It is within this world that this "technology generation" enjoys thinking, solving problems, and being engaged. The module has presented them a science topic in that world.
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Equally important from the standpoint of developers is what the students liked least (Table 2). Interestingly, equal numbers of responses indicated nothing negative to report and that there was too much information or the module was too hard to understand. In addition, some students reported that they liked least 1) the inability to solve the cases despite their best efforts and 2) the need to interpret data. While in the minority, these findings suggest that the module could be improved by providing more information to assist students in solving the cases. Additional student responses involved including more animations, adding audio, and having the module followed by real laboratory experiments, which would indicate a desire to learn more beyond the boundaries of the module.
Student responses to the opportunity to provide any additional feedback on the module that they did not address in previous questions yielded another vantage point from which to assess their impressions of the module. The following comments are representative of this feedback.
Collectively, the student feedback comments demonstrate that Cancer Cell Biology was an engaging, enjoyable activity that provided new insight into cancer.
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MODULE REVISIONS |
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Protooncogene and Tumor Suppressor Gene Review Component
The review was expanded to include more information and illustrations on
how mutations in protooncogenes and tumor suppressor genes result in changes
of cell cycle regulation (Figure 3, B and
C). With descriptions of how mutations in the coding and
regulatory regions affect the expression of the genes, students can
"discover" knowledge in the module to assist them with the
completion of the report questions for a patient case.
Report and Instructional Feedback Components
The report and feedback components of the module were revised 1) to
minimize further the chance of a diagnosis occurring by
guessing—accomplished by providing a minimum of three answers to all
questions—and 2) to provide better guided feedback to foster student
problem solving and self-discovery.
The feedback was restructured to consist of three levels of hierarchical response for the questions in each question set (Figure 5), replacing the single short feedback message (similar to Figure 5A). Thus, if a student repeatedly answers a question incorrectly, a new, more informative feedback message is given. The first message (Figure 5A) is general and mentions assays that will be helpful in answering the question, which will get the student to reinvestigate assays and think through the solution. Feedback on the second level (Figure 5B) expands upon key concepts and/or how to interpret critical assays, focusing the student's thinking on what needs to be evaluated to determine the solution. Finally, the third level (Figure 5C) guides the student more directly toward making key observations from important assays.
Given this more elaborate feedback structure, attention had to be given to how the multiple-question format would be implemented so that the chances of guessing the correct answers were kept to a minimum. To accomplish this, the feedback component engages only one question at a time, regardless of how many questions the student answers incorrectly. Further, the questions are addressed in the order in which they appear in the report. For example, if a student misses the second and third questions in Figure 4A, feedback would be provided only for the second question, beginning the student's review of content and concepts to submit a revised diagnosis. If, upon resubmission, the student answers the second question correctly, but again misses the third, the student will be informed that the third is incorrect and the feedback process for this question will begin. This design helps students 1) review the case in a progressive fashion, 2) address multiple incorrect answers individually, and 3) identify incorrect answers to subsequent questions during their reevaluation. For example, in the case described above, while seeking the answer for the second question the student might discover that he/she answered the third incorrectly, effectively providing an opportunity for reflection and self-recognition of errors in understanding. Thus, this feedback design maintains the challenging aspects of the module yet provides students additional guidance and information that helps them to be more successful at analyzing a case, thereby encouraging and enabling them to solve more cases.
Technical Improvements
Some of the module's technical improvements required bringing the module's
Flash program code up to version 5. Navigation was improved by reprogramming
the module to pop out into its own window instead of playing in the Web
browser window since navigation is independent of the browser. This feature
eliminates the natural tendency to use the browser navigation buttons, which
in this case causes the module to restart from the welcoming screen. To make
the student notes feature more useful, a print notes button feature was added,
which provides a hard copy of the notes for permanent reference. One new
feature is the ability of students to submit a verification report when they
have completed the analysis of a patient case
(Figure 4C). When the student
submits the verification, a report is generated and emailed to the instructor.
The report (Figure 6) contains
1) the name of the student submitting it, 2) the patient diagnosed, 3)
questions from the report screen of that patient, and 4) tracking information
indicating the answers the student selected for each submission. Thus, in
addition to evaluating student performance, the report provides insight into
how a student is progressing with understanding content and biological
concepts.
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DISCUSSION |
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TOPABSTRACTINTRODUCTIONTOPIC, MODULE, PEDAGOGY, AND...FEEDBACK ON MODULE DESIGNFEEDBACK FINDINGSMODULE REVISIONSDISCUSSIONREFERENCES |
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Using Cancer Cell Biology
This inquiry-based, interactive module was designed to be used in courses
that have as prerequisites student understanding of basic cell and molecular
biology principles, particularly concepts of gene expression and the cell
cycle and some associated experimental techniques. Used toward the end of a
semester, it can serve as a way for students to review concepts through a
specific topic/application and bridge concepts to experimental techniques,
data interpretation, and analysis. How an instructor chooses to implement the
module depends upon the instructor's pedagogical approach, goals, and
resources; e.g., the module can be assigned to individual or pairs of students
either as an in-class or a laboratory activity or as a homework assignment,
etc. Further, the instructor can choose to have students submit a verification
report via E-mail.
As a teaching tool, Cancer Cell Biology is designed to stimulate student interest and further discussion and exploration on the topic of cancer. Verification reports provide the instructor with information about student performance and progression. Thus, after students complete the module, the instructor is poised to extend cyclical learning in the classroom by using the module as a springboard for student–student discussion of additional follow-up questions, e.g., What known genes could fit the profile of genes identified in the patients?, as well as introducing and/or reinforcing concepts, terminology, and methods, such as 1) genes known to play roles in different cancers, e.g., bcl-2, p53, ras and HER2; 2) the concept that cancer is an accumulation of multiple gene mutations; 3) methods of cancer detection; and 4) the implications of multiple gene mutations for the design of effective cancer treatment therapies. Additional suggestions and details for instructors can be found on an accompanying Web page (Bockholt et al., 2002), where instructors are requested to provide feedback so we can share best practices in using the module broadly.
To elaborate on the cancer topic, there are a few other multimedia tools available. To provide students a different perspective on the disease state, another multimedia tool that consists of an open-ended simulation of breast cancer cases could be utilized (Lundeberg et al., 2002). It focuses on human genetics and includes techniques such as PCR, DNA digest, and Southern blotting to investigate a variety of diseases. This simulation is developed in considerable breadth and depth and consists of an intricate and complex user interface. The CD-ROMs that accompany some textbooks also cover aspects of cancer (Cooper, 1997; Alberts et al., 2002; Karp, 2002), though they are presentation-oriented, with drill/practice questions and answers, emphasizing fact memorization rather than problem-solving skills.
Simulating the Research Process and Conveying Complex Biological Concepts
Interactive multimedia has the potential to create student learning
experiences to facilitate the understanding of the scientific process and
biological concepts that cannot be achieved with the same information on paper
or in lecture. Cancer Cell Biology develops this potential by going
beyond creating "shovelware," i.e., the transfer of one medium to
another without taking advantage of the medium to do more
(Fraser, 1999). For example,
drill/practice and tutorial programs do not substantially change the way in
which students interact with knowledge and therefore do not contribute to
creating new ways to attach meaning to concepts
(Bottino, 2001).
While simplified, Cancer Cell Biology enables students to play the role of scientists performing experiments independently, analyzing their findings, and exploring existing knowledge and data to solve problems, providing a dynamic snapshot of the scientific process. Through its visual capacity and experiential power, Cancer Cell Biology takes advantage of multimedia to convey complex biological concepts. In addition, interactive problem-solving, evaluation, and feedback have been integrated for students to self-identify gaps in their understanding.
Undeniably, hands-on student research gives students the opportunity to learn both concepts and the scientific process in an active, inquiry-based approach. While this may be preferable to most simulations, it is not always feasible or practical. Simulating reality in its entirety while meeting educational goals and assessment needs can be difficult, however, as software evolves and the cost of production decreases, multimedia will be able to provide an even richer environment for science teaching and learning through simulation with advances in both three-dimensional multimedia and, in the future, virtual reality. Virtual reality promises to provide students the ideal simulation of the biological world and access to understanding the underlying concepts by adding the full body–mind kinesthetic dimension to participating in the scientific process (William et al., 1998). The extent to which "virtuality" can be achieved with current educational multimedia is largely dependent upon the time required for development and the cost weighed against the benefits. However, the decision to make use of these technologies will also be determined by the topic, state of the technology's development, learning goals, and limitations for dissemination and adoption. For now, current multimedia tools and designs can be used to create constructivist frameworks that begin to immerse students in environments with limited virtuality involving visual, aural, and textual representation of information (Harper et al., 2000).
Higher-Order Thinking Skills
One goal of science education reform is to shift from lower-order thinking
to higher-order thinking and learning skills
(Kronberg and Griffin, 2000;
Zoller, 2000). Multimedia
educational tools often do not allow students to develop higher-order thinking
skills, especially those that focus upon drill and practice. Stoney and Oliver
(1999) have asserted that in
order to use interactive multimedia in a way that encourages higher-order
thinking skills, one must depart from sequentially dispensing knowledge and
engage students in an applied setting. This enables them to reflect on their
learning and incorporate it with their preexisting knowledge. Further, by
providing potentially conflicting information, the student must resolve this
situation by sifting information, experimenting, and thinking strategically
and critically. Further, these learner-centered microworlds allow the student
to assume an active role, constructing learning according to needs,
preferences, and personal paths (Bottino,
2001). In Cancer Cell Biology, cognitive engagement is
supported on numerous levels through its intrinsic design: 1) topic relevancy;
2) nonlinearity; 3) the overall problem-solving scheme requiring a patient
diagnosis; 4) critical decision-making in the experimental assays; and 5)
reflection and reanalysis when students report an incorrect diagnosis and must
go back through the case to locate the origin(s) of their error(s) in
reasoning.
Module Development and Pedagogy
We have described how this module was designed primarily by using the 5E
model, which has many characteristics in common with multimedia instructional
design principles, including the aim to engage, encourage exploration, and
provide feedback with evaluation. Lavoie
(1995) describes an
instructional framework for implementing multimedia using a four-phase
learning cycle (hypothetico–predictive, exploration, term introduction,
and concept application) as the first of three design levels. The second level
addresses instructional design principles, while the third level addresses the
first two levels in the context of interactive videodisc instruction. Lavoie's
four-phase learning cycle and Bybee's
(1997) 5E model are similar
because they both have roots in the three-phase Atkin/Karplus learning cycle
(exploration, term introduction, and concept applications). The main
difference between these instructional models is the emphasis that the 5E
model places upon engaging students and evaluating their understanding as a
key part of the inquiry instructional model. In light of these similarities,
taking the straightforward 5E model and merging it with multimedia
instructional design principles should yield a cognitively engaging,
interactive multimedia-based learning environment and a unique
"multimedia pedagogy" for science education.
Summary
Cancer Cell Biology illustrates the potential of multimedia in
facilitating student learning of biological topics. The medium is able to
present learning in ways that are responsive to different learning styles and
to the most effective pedagogies for learning science. In addition, the module
can provide students some exposure to the research process, especially where
it may be unavailable due to limited resources and infrastructure.
For the authors of this report, the development of Cancer Cell Biology has laid a design foundation for the development of future multimedia modules to address important design and pedagogical questions by assessing the impact upon both teaching and learning. As teaching and learning methods co-evolve with technology, several questions emerge as to how best to support teaching and learning with multimedia, including 1) How can a multimedia learning environment provide an intellectual snapshot of the research process? 2) How can multimedia enable understanding of complex biological concepts? 3) How can inquiry learning principles (pedagogy) be adapted to multimedia-based learning environments? and 4) How can self-directed learning experiences using multimedia develop higher-order thinking skills? The answers to these questions will come only after considerable experimentation and assessment with multimedia on a variety of topics and designs. Nonetheless, the time has come for science education to engage multimedia-based learning and explore its potential.
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ACKNOWLEDGMENTS |
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Corresponding author. E-mail address:
bockholt{at}email.unc.edu.
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