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Approaches to Biology Teaching and Learning |

*Department of Biological Sciences, University of Delaware, Newark, DE 19716; and
Department of Biology, San Francisco State University, San Francisco, CA 94132
| INTRODUCTION |
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Use of rubrics provides one way to address these issues. Rubrics not only can be designed to formulate standards for levels of accomplishment and used to guide and improve performance but also they can be used to make these standards clear and explicit to students. Although the use of rubrics has become common practice in the K12 setting (Luft, 1999), the good news for those instructors who find the idea attractive is that more and more examples of the use of rubrics are being noted at the college and university level, with a variety of applications (Ebert-May, undated; Ebert-May et al., 1997; Wright and Boggs, 2002; Moni et al., 2005; Porter, 2005; Lynd-Balta, 2006).
| WHAT IS A RUBRIC? |
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A good way to think about what distinguishes a rubric from an explanation of an assignment is to compare it with a more common practice. When communicating to students our expectations for writing a lab report, for example, we often start with a list of the qualities of an excellent report to guide their efforts toward successful completion; we may have drawn on our knowledge of how scientists report their findings in peer-reviewed journals to develop the list. This checklist of criteria is easily turned into a scoring sheet (to return with the evaluated assignment) by the addition of checkboxes for indicating either a "yes-no" decision about whether each criterion has been met or the extent to which it has been met. Such a checklist in fact has a number of fundamental features in common with a rubric (Bresciani et al., 2004), and it is a good starting point for beginning to construct a rubric. Figure 1 gives an example of such a scoring checklist that could be used to judge a high school student poster competition.
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| DESIGNING A RUBRIC |
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As an example, examine the two rubrics presented in Tables 2 and 3, in which Table 2 shows a holistic rubric and Table 3 shows an analytical rubric. These two versions of a rubric were developed to evaluate student essay responses to a particular assessment prompt. In this case the prompt is a challenge in which students are to respond to the statement, "Plants get their food from the soil. What about this statement do you agree with? What about this statement do you disagree with? Support your position with as much detail as possible." This assessment prompt can serve as both a preassessment, to establish what ideas students bring to the teaching unit, and as a postassessment in conjunction with the study of photosynthesis. As such, the rubric is designed to evaluate student understanding of the process of photosynthesis, the role of soil in plant growth, and the nature of food for plants. The maximum score using either the holistic or the analytical rubric would be 10, with 2 points possible for each of five criteria. The holistic rubric outlines five criteria by which student responses are evaluated, puts a 3-point scale on each of these criteria, and holistically describes what a 0-, 1-, or 2-point answer would contain. However, this holistic rubric stops short of defining in detail the specific concepts that would qualify an answer for 0, 1, or 2 points on each criteria scale. The analytical rubric shown in Table 3 does define these concepts for each criteria, and it is in fact a fuller development of the holistic rubric shown in Table 2. As mentioned, the development of an analytical rubric is challenging in that it pushes the instructor to define specifically the language and depth of knowledge that students need to demonstrate competency, and it is an attempt to make discrete what is fundamentally a fuzzy, continuous distribution of ways an individual could construct a response. As such, informal analysis of student responses can often play a large role in shaping and revising an analytical rubric, because student answers may hold conceptions and misconceptions that have not been anticipated by the instructor.
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Reflection on one's particular answer to two critical questions"What do I want students to know and be able to do?" and "How will I know when they know it and can do it well?"is not only essential to beginning construction of a rubric but also can help confirm the choice of a particular assessment task as being the best way to collect evidence about how the outcomes have been met. A first step in designing a rubric, the development of a list of qualities that the learner should demonstrate proficiency in by completing an assessment task, naturally flows from this prior rumination on outcomes and on ways of collecting evidence that students have met the outcome goal. A good way to get started with compiling this list is to view existing rubrics for a similar task, even if this rubric was designed for younger or older learners or for different subject areas. For example, if one sets out to develop a rubric for a class presentation, it is helpful to review the criteria used in a rubric for oral communication in a graduate program (organization, style, use of communication aids, depth and accuracy of content, use of language, personal appearance, responsiveness to audience; Huba and Freed, 2000) to stimulate reflection on and analysis of what criteria (dimensions of quality) align with one's own desired learning outcomes. There is technically no limit to the number of criteria that can be included in a rubric, other than presumptions about the learners' ability to digest and thus make use of the information that is provided. In the example in Table 1, only three criteria were used, as judged appropriate for the desired outcomes of the high school poster competition.
After this list of criteria is honed and pruned, the dimensions of quality and proficiency will need to be separately described (as in Table 1), and not just listed. The extent and nature of this commentary depends upon the type of rubricanalytical or holistic. This task of expanding the criteria is an inherently difficult task, because of the requirement for a thorough familiarity with both the elements comprising the highest standard of performance for the chosen task, and the range of capabilities of learners at a particular developmental level. A good way to get started is to think about how the attributes of a truly superb performance could be characterized in each of the important dimensionsthe level of work that is desired for students to aspire to. Common advice (Moskal, 2000) is to avoid use of words that connote value judgments in these commentaries, such as "creative" or "good" (as in "the use of scientific terminology language is good"). These terms are essentially so general as to be valueless in terms of their ability to guide a learner to emulate specific standards for a task, and although it is admittedly difficult, they need to be defined in a rubric. Again, perusal of existing examples is a good way to get started with writing the full descriptions of criteria. Fortunately, there are a number of data banks that can be searched for rubric templates of virtually all types (Chicago Public Schools, 2000; Arter and McTighe, 2001; Shrock, 2006; Advanced Learning Technologies, 2006; University of Wisconsin-Stout, 2006).
The final step toward filling in the grid of the rubric is to benchmark the remaining levels of mastery or gradations of quality. There are a number of descriptors that are conventionally used to denote the levels of mastery in addition to the conventional excellent-to-poor scale (with or without accompanying symbols for letter grades), and several examples from among the more common of these are listed below:
Huba and Freed (2000) offer the interesting recommendation that the descriptions for each level of performance provide a "real world" connection by stating the implications for accomplishment at that level. This description of the consequences could be included in a criterion called "professionalism." For example, in a rubric for writing a lab report, at the highest level of mastery the rubric could state, "this report of your study would persuade your peers of the validity of your findings and would be publishable in a peer-reviewed journal." Acknowledging this recommendation in the construction of a rubric might help to steer students toward the perception that the rubric represents the standards of a profession, and away from the perception that a rubric is just another way to give a particular teacher what he or she wants (Andrade and Du, 2005).
As a further help aide for beginning instructors, a number of Web sites, both commercial and open access, have tools for online construction of rubrics from templates, for example, Rubistar (Advanced Learning Technologies, 2006) and TeAch-nology (TeAch-nology, undated). These tools allow the would-be "rubrician" to select from among the various types of rubrics, criteria, and rating scales (levels of mastery). Once these choices are made, editable descriptions fall into place in the proper cells in the rubric grid. The rubrics are stored in the site databases, but typically they can be downloaded using conventional word processing or spreadsheet software. Further editing can result in a rubric uniquely suitable for your teaching/learning goals.
| ANALYZING AND REPORTING INFORMATION GATHERED FROM A RUBRIC |
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Multiple-choice exams have the advantage that they can be computer or machine scored, allowing for analysis and storage of more specific information about different content understandings (particularly misconceptions) for each item, and for large numbers of students. The standard rubric-referenced assessment is not designed to easily provide this type of analysis about specific details of content understanding; for the types of tasks for which rubrics are designed, content understanding is typically displayed by some form of narrative, free-choice expression. To try to capture both the benefits of the free-choice narrative and generate an in-depth analysis of students' content understanding, particularly for large numbers of students, a special type of rubric, called the double-digit, is typically used. A large-scale example of use of this type of scoring rubric is given by the Trends in International Mathematics and Science Study (1999). In this study, double-digit rubrics were used to code and analyze student responses to short essay prompts.
To better understand how and why these rubrics are constructed and used, refer to the example provided in Figure 2. This double-digit rubric was used to score and analyze student responses to an essay prompt about ecosystems that was accompanied by the standard "sun-tree-bird" diagram (a drawing of the sun, a tree, and other plants; various primary and secondary consumers; and some not well-identifiable decomposers, with interconnecting arrows that could be interpreted as energy flow or cycling of matter). A brief narrative, summarizing the "big ideas" that could be included in a complete response, along with a sample response that captures many of these big ideas accompanies the actual rubric. The rubric itself specifies major categories of student responses, from complete to various levels of incompleteness. Each level is assigned one of the first digits of the scoring code, which could actually correspond to a conventional point total awarded for a particular response. In the example in Figure 2, a complete response is awarded a maximum number of 4 points, and the levels of partially complete answers, successively lower points. Here, the "incomplete" and "no response" categories are assigned first digits of 7 and 9, respectively, rather than 0 for clarity in coding; they can be converted to zeroes for averaging and reporting of scores.
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| WHY USE RUBRICS? |
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From the instructor's perspective, although the time expended in developing a rubric can be considerable, once rubrics are in place they can streamline the grading process. The more specific the rubric, the less the requirement for spontaneous written feedback for each piece of student workthe type that is usually used to explain and justify the grade. Although provided with fewer written comments that are individualized for their work, students nevertheless receive informative feedback. When information from rubrics is analyzed, a detailed record of students' progress toward meeting desired outcomes can be monitored and then provided to students so that they may also chart their own progress and improvement. With team-taught courses or multiple sections of the same course, rubrics can be used to make faculty standards explicit to one another, and to calibrate subsequent expectations. Good rubrics can be critically important when student work in a large class is being graded by teaching assistants.
Finally, by their very nature, rubrics encourage reflective practice on the part of both students and teachers. In particular, the act of developing a rubric, whether or not it is subsequently used, instigates a powerful consideration of one's values and expectations for student learning, and the extent to which these expectations are reflected in actual classroom practices. If rubrics are used in the context of students' peer review of their own work or that of others, or if students are involved in the process of developing the rubric, these processes can spur the development of their ability to become self-directed and help them develop insight into how they and others learn (Luft, 1999).
| ACKNOWLEDGMENTS |
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| FOOTNOTES |
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| REFERENCES |
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