Feature Image- Bloom’s Taxonomy

Domains of Human Learning

Learning is the process through which humans acquire knowledge and develop skills or behaviour. It is a continuous process. Learning begins from a simple, elementary level, and grows in terms of complexity. It does not have an abrupt beginning or ending. The Bloom’s Taxonomy is an attempt to arrange the knowledge and skills acquired through continuous learning in a hierarchical order, ranging from simpler to complex skills.

Table on domains of Human Learning
Figure 1. Domains of Learning

Humans have been found to learn through three distinct modes – thoughts, emotions, and actions. Each of these modes enables a human being to acquire/develop a certain kind of ability. Thoughts help humans develop abilities such as memorizing, reasoning, etc. Emotions help develop abilities such as motivation, appreciation, enthusiasm, etc. Actions help develop abilities such as hand-eye-coordination, typing, playing an instrument, etc. In simple words, humans learn through thinking, feeling or doing, or through a combination of these. The set of skills acquired through a particular mode constitutes a “domain”. Thus, there are three domains of learning, one domain corresponding to each mode of learning. These are: cognitive domain (thoughts/thinking), affective domain (feeling/emotions) and psychomotor domain (actions). The table in figure-1 presented here, summarizes the different domains, their corresponding modes and examples of abilities acquired through each of these modes.

Readers may access a more detailed definition of learning at webpage: What is learning at the Queens University, Canada website. More information on domains of learning and instruction is available in: Unit -1 titled Differentiating Between Psychomotor, Cognitive, and Affective Domains of Instruction at the KNILT website.


The Bloom’s Taxonomy

Order of Cognitive Skills in Bloom’s Taxonomy
Figure 2. Order of Cognitive Skills in Bloom’s Taxonomy

The skills that constitute a domain may range from simple to complex in nature. A scheme of classification (taxonomy) helps arrange the skills in a hierarchical manner. Each domain of human learning has its own hierarchy of skills. Simple skills are at a lower level and complex skills at a higher level of the hierarchy. The skills at the lower level of the hierarchy are a pre-requisite to develop a skill at a higher level. The figure-2 presented here depicts the hierarchy of skills in the cognitive domain. This taxonomy (a hierarchical classification) of human skills was developed in 1956 by Prof. Benjamin S. Bloom, who was the Associate Director of the Board of Examinations at the University of Chicago. The taxonomy is a result of his work at understanding how educators evaluate a student’s performance at examinations. 

Readers may go through the article Bloom’s Taxonomy on the Open Colleges, Australia website.


The Origins of the Bloom’s Taxonomy

Prof. Bloom discovered that the objective of an academic exercise (lesson, examination, etc) was a matter of subjective inference amongst educators and teachers. This led to a variation in the outcomes that learners achieved by the end of an academic exercise. Thus, Prof. Bloom along with his graduate students set upon the task of developing a framework which could standardize the objectives of academic exercises. This framework also established uniformity and standardization in terms of learning outcomes that are expected to be achieved by the end of an academic exercise. In addition, it also helped academics avoid making redundant efforts which lead to same academic outcomes ultimately.

Formal education today, however, has developed more around the process of thinking rather than the processes of emotions or actions. It is thus the cognitive domain in Bloom’s taxonomy that has been very widely adopted in formal education. The taxonomy of cognitive skills was detailed in 1956, that of affective skills in 1964, and psychomotor skills, in the 1970s.

Figure-3 depicts each level in the hierarchy of cognitive skills along with some unique action verbs associated with each level. These action verbs outline the different kinds of academic exercises and activities recommended for developing skills pertaining to different levels in the Bloom’s taxonomy.

Action Verbs corresponding to different levels in the Bloom's Taxonomy
Figure 3. Action Verbs Corresponding to Different Levels in The Bloom’s Taxonomy

The Taxonomy at Work

The Bloom’s taxonomy intends to promote higher order thinking rather than rote learning amongst learners. Unique action verbs associate with each level in this taxonomy. These verbs are useful for developing observable and measurable objectives for an academic exercise. The table in figure-4 presents a few objectives employing the appropriate action verbs for different levels of the Bloom’s Taxonomy.

Table showing lesson objectives using the Bloom's Taxonomy
Figure 4. Lesson Objectives Using the Bloom’s Taxonomy

More examples on writing learning outcomes using the Bloom’s Taxonomy are available at the webpage: Writing Learning Outcomes Using Bloom’s Revised Taxonomy at the University of Toronto website. A similar effort with action verbs can be undertaken to develop questions for an assessment. The webpage: A Guide to Bloom’s Taxonomy at The Innovative Instructor Blog, Johns Hopkins University, offers guidance on writing test questions and course learning objectives using the Bloom’s Taxonomy.

Bloom’s taxonomy proves useful as a guide to design foundation and advanced courses as well. A foundation course may have academic content developed around lower order cognitive levels. An advanced course on the other hand, may focus on higher order cognitive skills. Bloom’s taxonomy thus useful in defining and developing academic exercises to focus on a particular cognitive skill level. This, in turn, ensures that the learning outcomes are uniform and standardized across a spectrum of learners.


The Revised Bloom’s Taxonomy

Text Diagram depicting original Bloom's Taxonomy
Figure 5. The Original Bloom’s Taxonomy

The taxonomy presented in this article is the revised Bloom’s Taxonomy, published in the year 2001. The figure-5 shows the original taxonomy, published in the year 1956. A careful comparison between the two taxonomies given in figure-2  (revised) and figure-5 (original) shows that there is a change in the order of the top two cognitive skills. This interchange was done in accordance with the flow of the human learning process: humans conduct an evaluation, prior to creating something. In addition, the new taxonomy has a separate and distinct taxonomy of the types of knowledge used in cognition. This separate knowledge taxonomy is presented below, in brief.

  • Factual Knowledge
  • Conceptual Knowledge
  • Procedural Knowledge
  • Metacognitive Knowledge

The articles: Bloom’s Taxonomy at Vanderbilt University website and Three Domains of Learning-Cognitive, Affective, Psychomotor at The Second Principle webpage provide a detailed comparison of the Original and Revised Bloom’s Taxonomy.


Additional Reference:

  1. The discussion: What is the importance of Bloom’s Taxonomy for the assessment and the strategies of the Cognitive Learning? at

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For further reading related to pedagogy and education standards, please visit the blog pages at Evelyn Learning.




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