Bloom's Taxonomy of Educational Objectives.
One of the most widely used ways of
organizing levels of expertise is according to Bloom's Taxonomy
of Educational Objectives.3 Bloom's Taxonomy (Tables 1-3) uses a multi-tiered scale to express the level of expertise required to achieve each measurable student outcome. Organizing measurable student outcomes in this way will allow us to select appropriate classroom assessment techniques for the course.
There are three taxonomies. Which of the three to use for a given measurable student outcome depends upon the original goal to which the measurable student outcome is connected. There are knowledge-based goals, skills-based goals, and affective goals (affective: values, attitudes, and interests); accordingly, there is a taxonomy for each. Within each taxonomy, levels of expertise are listed in order of increasing complexity. Measurable student outcomes that require the higher levels of expertise will require more sophisticated classroom assessment techniques.
The course goal in Figure 2--"student understands proper dental hygiene"--is an example of a knowledge-based goal. It is knowledge-based because it requires that the student learn certain facts and concepts. An example of a skills-based goal for this course might be "student flosses teeth properly." This is a skills-based goal because it requires that the student learn how to do something. Finally, an affective goal for this course might be "student cares about proper oral hygiene." This is an affective goal because it requires that the student's values, attitudes, or interests be affected by the course.
Table 1: Bloom's Taxonomy of Educational Objectives for Knowledge-Based Goals
Level of Expertise |
Description of Level |
Example of Measurable Student Outcome |
1. Knowledge |
Recall, or recognition of terms, ideas, procedure, theories, etc. |
When is the first day of Spring? |
2. Comprehension |
Translate, interpret, extrapolate, but not see full implications or transfer to other situations, closer to literal translation. |
What does the summer solstice represent? |
3. Application |
Apply abstractions, general principles, or methods to specific concrete situations. |
What would Earth's seasons be like if its orbit was perfectly circular? |
4. Analysis |
Separation of a complex idea into its constituent parts and an understanding of organization and relationship between the parts. Includes realizing the distinction between hypothesis and fact as well as between relevant and extraneous variables. |
Why are seasons reversed in the southern hemisphere? |
5. Synthesis |
Creative, mental construction of ideas and concepts from multiple sources to form complex ideas into a new, integrated, and meaningful pattern subject to given constraints. |
If the longest day of the year is in June, why is the northern hemisphere hottest in August? |
6. Evaluation |
To make a judgment of ideas or methods using external evidence or self-selected criteria substantiated by observations or informed rationalizations. |
What would be the important variables for predicting seasons on a newly discovered planet? |
Table 2: Bloom's Taxonomy of Educational Objectives for Skills-Based Goals
Level of Expertise |
Description of Level |
Example of Measurable Student Outcome |
Perception |
Uses sensory cues to guide actions |
Some of the colored samples you see will need dilution before you take their spectra. Using only observation, how will you decide which solutions might need to be diluted? |
Set |
Demonstrates a readiness to take action to perform the task or objective |
Describe how you would go about taking the absorbance spectra of a sample of pigments? |
Guided Response |
Knows steps required to complete the task or objective |
Determine the density of a group of sample metals with regular and irregular shapes. |
Mechanism |
Performs task or objective in a somewhat confident, proficient, and habitual manner |
Using the procedure described below, determine the quantity of copper in your unknown ore. Report its mean value and standard deviation. |
Complex Overt Response |
Performs task or objective in a confident, proficient, and habitual manner |
Use titration to determine the Ka for an unknown weak acid. |
Adaptation |
Performs task or objective as above, but can also modify actions to account for new or problematic situations |
You are performing titrations on a series of unknown acids and find a variety of problems with the resulting curves, e.g., only 3.0 ml of base is required for one acid while 75.0 ml is required in another. What can you do to get valid data for all the unknown acids? |
Organization |
Creates new tasks or objectives incorporating learned ones |
Recall your plating and etching experiences with an aluminum substrate. Choose a different metal substrate and design a process to plate, mask, and etch so that a pattern of 4 different metals is created. |
Table 3: Bloom's Taxonomy of Educational Objectives for Affective Goals
Level of Expertise |
Description of Level |
Example of Measurable Student Outcome |
Receiving |
Demonstrates a willingness to participate in the activity |
When I'm in class I am attentive to the instructor, take notes, etc. I do not read the newspaper instead. |
Responding |
Shows interest in the objects, phenomena, or activity by seeking it out or pursuing it for pleasure |
I complete my homework and participate in class discussions. |
Valuing |
Internalizes an appreciation for (values) the objectives, phenomena, or activity |
I seek out information in popular media related to my class. |
Organization |
Begins to compare different values, and resolves conflicts between them to form an internally consistent system of values |
Some of the ideas I've learned in my class differ from my previous beliefs. How do I resolve this? |
Characterization by a Value or Value Complex |
Adopts a long-term value system that is "pervasive, consistent, and predictable" |
I've decided to take my family on a vacation to visit some of the places I learned about in my class. |
To determine the level of expertise required for each measurable student outcome, first decide which of these three broad categories (knowledge-based, skills-based, affective) the corresponding course goal belongs to. Then, using the appropriate Bloom's Taxonomy, look over the descriptions of the various levels of expertise. Determine which description most closely matches that measurable student outcome. As can be seen from the examples given in the three Tables, there are different ways of representing measurable student outcomes, e.g., as statements about students (Figure 2), as questions to be asked of students (Tables 1 and 2), or as statements from the student's perspective (Table 3). You may find additional ways of representing measurable student outcomes; those listed in Figure 2 and in Tables 1-3 are just examples.
Bloom's Taxonomy is a convenient way to describe the degree to which we want our students to understand and use concepts, to demonstrate particular skills, and to have their values, attitudes, and interests affected. It is critical that we determine the levels of student expertise that we are expecting our students to achieve because this will determine which classroom assessment techniques are most appropriate for the course. Though the most common form of classroom assessment used in introductory college courses--multiple choice tests--might be quite adequate for assessing knowledge and comprehension (levels 1 and 2, Table 1),
this type of assessment often falls short when we want to assess our students knowledge at the higher levels
of synthesis and evaluation (levels 5 and 6).4
Multiple-choice tests also rarely provide information about achievement of skills-based goals. Similarly, traditional course evaluations, a technique commonly used for affective assessment, do not generally provide useful information about changes in student values, attitudes, and interests.
Thus, commonly used assessment techniques, while perhaps providing a means for assigning grades, often do not provide us (nor our students) with useful feedback for determining whether students are attaining our course goals. Usually, this is due to a combination of not having formalized goals to begin with, not having translated those goals into outcomes that are measurable, and not using assessment techniques capable of measuring expected student outcomes given the levels of expertise required to achieve them. Using the CIA model of course development, we can ensure that our curriculum, instructional methods, and classroom assessment techniques are properly aligned with course goals.
Note that Bloom's Taxonomy need not be applied exclusively after course goals have been defined. Indeed, Bloom's Taxonomy and the words associated with its different categories can help in the goals-defining process itself. Thus, Bloom's Taxonomy can be used in an iterative fashion to first state and then refine course goals. Bloom's Taxonomy can finally be used to identify which classroom assessment techniques are most appropriate for measuring these goals.
Selecting Course Curriculum (Content) and Classroom Assessment Techniques
We are now at the point in the course development "road map" where concrete decisions must be made about what will be included in the course curriculum. As the instructor of the course, choices about course content are entirely yours to make based upon what you want your students to take from the course. It would be beyond the scope of this document to attempt to discuss specific choices about curriculum in detail. We do comment, however, that here again goals are paramount. If you are working from an existing syllabus (either your own or someone else's), take this opportunity to critically re-examine each component of the curriculum with respect to your course goals. Are there topics in the syllabus that are not related to one or more course goals? Don't include content merely because "it's always been done that way" or because "it's important". If a topic is important, it will be reflected in your goals. If an "important" topic is not reflected in your course goals, you may wish to re-visit the goals themselves. In any case, each and every aspect of the curriculum should connect clearly to course goals.
This is also the point in the course development "road map" where specific classroom assessment techniques (CATs) must be selected based upon measurable student outcomes and their associated levels of expertise. The FLAG site was designed primarily to help you through this step in the course development process. Provided for your use are a variety of CATs that have been tested in the field and which are authored by national experts in the use of that particular technique. To be sure, the CATs provided in the FLAG site are but a subset of innovative CATs available from a variety of resources. The CATs provided in the FLAG site should give you a good start.
The CATs selected in this step will provide the feedback you need to evaluate the extent to which yours course goals have been achieved. Thus, it is imperative that the CATs you select be properly matched with your measurable student outcomes. The FLAG site provides a facility for helping you do this.
Choosing and Implementing Instructional Methods
With your course goals formalized, having translated those goals into measurable student outcomes and assigning to each appropriate levels of expertise, and having selected the course curriculum and CATs, we are finally in a position to actually teach. That is, we are at the point in the course development "road map" where we choose and implement the instructional methods that will best guide our students to attainment of our course goals.
As with choosing curriculum and assessment, the choice of instructional methods must be guided by our course goals and, perhaps even more so, by the levels of expertise associated with measurable student outcomes. For example, suppose that two of the course goals in an introductory engineering course are that (1) students learn how to "design simple machines that satisfy realistic constraints" and (2) that students "can work effectively as part of a design team". A common measurable student outcome for these goals might be that "students, working in a team, can design a device, using simple raw materials, that protects an egg when dropped from a height of two stories". This measurable student outcome is at the "Organization" level of expertise (Bloom's Taxonomy of Educational Objectives for Skills-Based Goals; Table 2) because it requires students to "create new tasks or objectives incorporating learned ones". Traditional lecturing alone would not be a sufficient instructional method in this case. Instead, an instructional method that emulates teamwork and that promotes creative thought would be more appropriate. That is, a more collaborative instructional method is called for.
A variety of instructional methods have been developed for guiding students to the different levels of expertise represented by the goals of our course. One commonly used instructional method--collaborative learning--is described in detail in the College Level One's Collaborative Learning website. In fact, you will find that collaborative learning instructional methods are appropriate and useful for a wide variety of goals, outcomes, and levels of expertise.
Conducting Assessment and Evaluating Attainment of Goals: Closing the Feedback Loop
It is in this final step of the course development process that we harness the power of the data provided by the CATs used during the implementation of the course. Some of this assessment data may be used for assigning grades to our students. Ultimately, however, the real value of this assessment data comes when we use it for improving the course. That is, our assessment data provide us with critical feedback for evaluating what we've done: What works and what doesn't? Depending upon the CATs we have chosen, this feedback may be used either at the end of the course (to summarize the efficacy of our course development efforts) or along the way (to inform our course development efforts in progress). When assessment data is used to evaluate the course in summary fashion at the end, it is called summative. When assessment data is used to modify the course while it is in progress, it is called formative. Either way, the point of assessment is to give us the information we need for evaluating achievement of our course goals.
How, specifically, do we perform this evaluation? By what criteria do we know if we have achieved our goals? Our measurable student outcomes are the key: If these outcomes are realized, we will know that we have attained our course goals. Look at the assessment data. Did your students achieve the hoped-for outcomes, and at the desired levels of expertise? Using the engineering example from above, perhaps the egg survived but only because one student in the team did all of the work, i.e., the outcome related to teamwork was not realized. How might you modify the course to better foster effective teamwork? Perhaps students needed more guidance on how to work collaboratively; consider how the curriculum and/or instructional methods might be changed to accomplish this. Or perhaps it is the teamwork goal itself that needs refining. It is this important, evaluative step that allows you to determine the extent to which you are reaching your course goals and to decide if there are changes you would like to make.
We close this section by noting that the terms assessment and evaluation are often incorrectly used interchangeably. Assessment is the collecting of data to inform both the instructor and the student as to how the course is progressing (formative) or how it has ended (summative). Assessment involves gathering data via one or more classroom assessment techniques. Evaluation is what we do with these data once we have them. Once we have acquired the assessment data, it is up to us to judge the efficacy of our instructional methods, the content of our course, and the achievement of our course goals.
Figure 3 - Road Map of Course Development.
Summary
Assessment Is Feedback for both Students and Instructors
The perspective that has been advocated here is that we can use carefully constructed classroom assessment techniques as a means of determining whether or not we are meeting our stated course goals, not just for assigning our students grades. For us, classroom assessment can help us answer the following questions:
- To what extent are my students achieving the stated course goals?
- How should I allocate class time for the current topic?
- Can I introduce this topic in a more effective way?
- What parts of this course are my students finding most valuable?
- How will I change this course the next time I teach it?
- Which grades do I assign my students?
For our students, classroom assessment answers a different set of questions:
- Do I know what my instructor thinks is most important?
- Am I mastering the course content?
- How can I improve the way I study in this course?
- What grade am I earning in this course?
Answering these questions and others can inform and improve the quality of student learning in our classes.
A Charge to Change
We can not emphasize enough how important it is to actually write down your course goals and share them with your students. Our goals are what bind the course together (Figure 3). Our choices of curriculum, instruction, and assessment are all guided by--and held together by--our goals. Once your course goals are set, questions about instruction, assessment, and grading will be much more focused. This is a small step beyond the assessment strategies that most faculty are already doing; yet with a small investment in planning, the data acquired can provide valuable feedback for improving the quality of student learning. And ultimately, our students are what course development is all about.
Resources
3. Bloom et al., 1994; Gronlund, 1991; Krathwohl et al., 1956
4. Bloom et al., 1994; Tobias & Raphael, 1997
Tell me more about assessment:
