Bloom's and Revised Taxonomy of Educational Objectives

Understanding the goals of education is crucial for effective teaching and learning. Educational objectives provide a framework for what students should know or be able to do after a learning experience. Benjamin Bloom and his associates developed a taxonomy, or classification system, for educational objectives. This system helps educators categorize and plan learning experiences to foster higher-order thinking skills in students. Bloom's original taxonomy has been revised to better reflect contemporary educational practices.

Bloom's Original Taxonomy of Educational Objectives

In 1956, Benjamin Bloom, along with Max Englehart, Edward Furst, Walter Hill, and David Krathwohl, published the first handbook of the taxonomy of educational objectives. This taxonomy aimed to classify the goals of educational learning. It is divided into three main domains: the cognitive domain (knowledge, comprehension, and application), the affective domain (attitudes, values, and emotions), and the psychomotor domain (manual or physical skills). For most classroom teaching, the cognitive domain is the most frequently used.

Cognitive Domain (Original Taxonomy)

The cognitive domain deals with intellectual outcomes. It is organized in a hierarchy from simple to complex, meaning that each level is assumed to build upon the preceding ones. The levels are:

• Knowledge: This is the most basic level, involving the recall of facts, terms, basic concepts, and answers. It requires students to remember information.
• Comprehension: This involves understanding the meaning of information. Students can explain ideas or concepts in their own words.
• Application: This level involves using learned material in new and concrete situations. Students can apply knowledge to solve problems.
• Analysis: This involves breaking down information into its component parts to reveal its structure and relationships. Students can differentiate, organize, and attribute.
• Synthesis: This involves putting together elements to form a new whole. Students can create, design, and formulate.
• Evaluation: This is the highest level, involving making judgments about the value of ideas or materials. Students can justify, critique, and appraise.

For example, a student who can simply list the planets in the solar system is demonstrating knowledge. A student who can explain the characteristics of each planet is demonstrating comprehension. A student who can calculate the distance to a planet using astronomical data is demonstrating application. A student who can compare and contrast the atmospheric conditions of two planets is demonstrating analysis. A student who can design a hypothetical mission to Mars is demonstrating synthesis. Finally, a student who can argue which planet is most suitable for human colonization based on scientific evidence is demonstrating evaluation.

Affective Domain (Original Taxonomy)

This domain deals with emotions, feelings, values, and attitudes. The levels are:

• Receiving: Awareness of or sensitivity to existence, phenomena, or stimuli.
• Responding: Active attention to or response to phenomena.
• Valuing: The worth or value a student attaches to a particular object, phenomenon, or behavior.
• Organization: Organizing values into priorities by comparing, contrasting, and integrating them.
• Characterization by Value: Acting consistently in accordance with the values organized.

Psychomotor Domain (Original Taxonomy)

This domain deals with physical movement, coordination, and the use of motor skills. While Bloom's original work did not fully detail this domain, others have developed it. Common levels include:

• Perception: The ability to use sensory stimuli to guide motor activity.
• Set: Readiness to perform a particular action.
• Guided Response: The imitation of a displayed skill.
• Mechanism: The ability to perform a skill with some confidence and proficiency.
• Complex Overt Response: The skillful performance of complex motor acts.
• Adaptation: Modifying skills to fit special requirements.
• Origination: Creating new motor acts.

Revised Taxonomy of Educational Objectives (Anderson & Krathwohl, 2001)

In 2001, Lorin Anderson, a former student of Bloom, and David Krathwohl, along with other educational researchers, published a revision of Bloom's taxonomy. The revision made several key changes:

• The names of the levels in the cognitive domain were changed from nouns to verbs. This emphasizes the active nature of learning and doing.
• The order of the top two levels was switched: Synthesis became Creating and moved to the highest level, while Evaluation became the second-highest level.
• A new dimension, the "Knowledge Dimension," was added, distinguishing between factual, conceptual, procedural, and metacognitive knowledge.

Cognitive Domain (Revised Taxonomy)

The revised cognitive domain levels are:

1. Remembering: Recalling facts and basic concepts. (e.g., define, list, recall, name, repeat, state)
2. Understanding: Explaining ideas or concepts. (e.g., clarify, describe, identify, explain, paraphrase, summarize)
3. Applying: Using information in new situations. (e.g., execute, implement, solve, use, demonstrate, apply)
4. Analyzing: Drawing connections among ideas. (e.g., differentiate, organize, relate, compare, contrast, distinguish)
5. Evaluating: Justifying a stand or decision. (e.g., appraise, argue, defend, judge, select, support, value)
6. Creating: Producing new or original work. (e.g., design, assemble, construct, develop, formulate, author)

Let's revisit the planet example using the revised taxonomy.

• Remembering: Naming the planets in order from the sun. (e.g., "List the planets.")
• Understanding: Explaining why Pluto is no longer classified as a planet. (e.g., "Summarize the criteria for planetary classification.")
• Applying: Using Kepler's laws to calculate the orbital period of a hypothetical exoplanet. (e.g., "Apply the formula to find the orbital period.")
• Analyzing: Comparing the geological history of Mars and Earth. (e.g., "Differentiate between the evidence for past water on Mars and Earth.")
• Evaluating: Arguing for or against the feasibility of terraforming Mars. (e.g., "Justify whether terraforming Mars is a viable long-term goal.")
• Creating: Designing a sustainable habitat for humans on the Moon. (e.g., "Develop a plan for a lunar base.")

Knowledge Dimension (Revised Taxonomy)

The revised taxonomy also includes a knowledge dimension, which describes the type of knowledge students are expected to acquire.

• Factual Knowledge: The basic elements of a discipline that students must know to be acquainted with a discipline or solve problems in it. (e.g., terminology, specific details, elements).
• Conceptual Knowledge: The interrelationships among the basic elements of a structure that can be used either in larger form or in combination with others. (e.g., classifications, categories, principles, generalizations, theories, models, structures).
• Procedural Knowledge: How to do something; methods of inquiry, and criteria for using skills, algorithms, techniques, and methods. (e.g., skills, algorithms, techniques, methods).
• Metacognitive Knowledge: Knowledge of cognition in general as well as awareness and knowledge of one's own cognition. (e.g., strategic knowledge, knowledge about cognitive tasks, self-knowledge).

For instance, knowing the definition of "photosynthesis" is factual knowledge. Understanding the overall process and its importance to life on Earth is conceptual knowledge. Knowing the steps involved in conducting a photosynthesis experiment is procedural knowledge. Reflecting on one's own understanding of photosynthesis and identifying areas needing more study is metacognitive knowledge.

Levels of Teaching

Teaching can be viewed as occurring at different levels, moving from basic information transmission to deeper cognitive engagement. These levels align closely with Bloom's taxonomy, particularly the cognitive domain. The three primary levels of teaching are Memory Level, Understanding Level, and Reflective Level.

1. Memory Level Teaching (MLT)

This is the most basic level of teaching. At this level, the focus is on the rote memorization and recall of facts, information, and concepts. The teacher presents information, and the students are expected to remember it. This level is foundational but insufficient on its own for deep learning.

• Characteristics:
• Emphasis on recall and reproduction of information.
• Teacher-centric: The teacher is the primary source of information.
• Content is presented in a structured, often fragmented, manner.
• Assessment involves questions that require direct recall (e.g., "What is the capital of France?").
• Little to no emphasis on comprehension or application.
• Teacher's Role: To present information clearly and systematically, and to drill students for memorization.
• Student's Role: To listen, record, and memorize the presented information.
• Example: Learning the names of historical figures and their birth/death dates, memorizing multiplication tables, reciting definitions.

2. Understanding Level Teaching (ULT)

This level moves beyond mere memorization to foster comprehension. Students are expected not only to remember information but also to grasp its meaning, understand relationships between facts, and be able to explain concepts in their own words.

• Characteristics:
• Emphasis on comprehension, explanation, and interpretation.
• Students learn to generalize, classify, and summarize information.
• Teacher encourages questions, discussions, and exploration of relationships.
• Assessment involves questions that require explanation, comparison, and contrast (e.g., "Explain the causes of World War I," "Compare and contrast the economic systems of two countries.").
• Builds upon memory level by adding meaning and context.
• Teacher's Role: To facilitate understanding by posing questions, encouraging discussion, providing examples, and helping students make connections.
• Student's Role: To actively participate in discussions, ask clarifying questions, and attempt to explain concepts in their own words.
• Example: Understanding the concept of democracy by comparing it to other forms of government, explaining the water cycle, grasping the principles of gravity.

3. Reflective Level Teaching (RLT)

This is the highest and most sophisticated level of teaching. It encourages students to think critically about the subject matter, analyze problems from multiple perspectives, and develop their own solutions or insights. It involves deep cognitive engagement and the development of higher-order thinking skills.

• Characteristics:
• Emphasis on critical thinking, problem-solving, and creativity.
• Students are encouraged to question assumptions, explore ambiguities, and propose solutions.
• Teacher acts as a facilitator, guiding students through complex issues and encouraging deep inquiry.
• Assessment involves tasks that require critical analysis, evaluation, and synthesis (e.g., "Analyze the ethical implications of genetic engineering," "Propose a solution to reduce plastic pollution in oceans.").
• Students develop intellectual independence and the ability to learn autonomously.
• Teacher's Role: To pose challenging problems, facilitate critical discussions, provide resources, and encourage independent thought and inquiry.
• Student's Role: To engage in deep thinking, analyze complex issues, formulate arguments, propose solutions, and reflect on their own learning process.
• Example: Debating the pros and cons of a scientific discovery, developing a research proposal for a social issue, writing an essay critically evaluating a historical event.

Relationship Between Bloom's Taxonomy and Levels of Teaching

Bloom's Taxonomy provides the framework for the cognitive skills that are developed at each level of teaching.

• Memory Level Teaching focuses on the Remembering and basic Understanding (recalling facts) aspects of the taxonomy.
• Understanding Level Teaching focuses on Understanding, Applying, and the initial stages of Analyzing information.
• Reflective Level Teaching aims to develop skills at the Analyzing, Evaluating, and Creating levels, requiring students to engage deeply with the material and apply higher-order thinking.

Effective teaching aims to move students progressively through these levels. While basic recall (memory level) is necessary, a truly educated individual can understand, analyze, evaluate, and create. Teachers must design their instruction and assessments to promote these higher-order thinking skills, moving beyond simple memorization to foster deep and meaningful learning.

Example Scenario: Teaching Photosynthesis

Level of Teaching	Bloom's Taxonomy (Revised)	Teacher's Activity	Student's Activity	Assessment Example
Memory Level	Remembering	Present the definition and basic equation of photosynthesis. Drill students on terms.	Memorize the definition and equation. Recall key terms like chlorophyll, carbon dioxide, water, glucose, oxygen.	"What are the inputs of photosynthesis?" "Write the chemical equation for photosynthesis."
Understanding Level	Understanding, Applying	Explain the process, its importance, and how different factors (light, CO2) affect it. Use diagrams and real-world examples.	Explain the process in their own words. Relate photosynthesis to plant growth and oxygen production. Apply knowledge to predict outcomes if light is removed.	"Explain why photosynthesis is essential for life on Earth." "How does the absence of sunlight affect a plant?"
Reflective Level	Analyzing, Evaluating, Creating	Pose questions about optimizing photosynthesis in different environments, discuss ethical implications of artificial photosynthesis, or challenge students to design an experiment.	Analyze how environmental factors interact. Evaluate the pros and cons of different methods to enhance plant growth. Propose experimental designs or solutions to agricultural challenges.	"Analyze the impact of climate change on global photosynthesis rates." "Design an experiment to test the effect of varying CO2 concentrations on plant yield." "Critique the feasibility of using genetically modified crops to increase photosynthetic efficiency."

By understanding these levels of teaching and their connection to Bloom's taxonomy, educators can strategically plan lessons that cater to different learning needs and progressively build students' cognitive abilities from basic recall to complex problem-solving and innovation.