Webb's Depth of Knowledge (DOK) — A Teacher's Guide

Webb's Depth of Knowledge (DOK) is a framework developed by Norman Webb that classifies the cognitive complexity of tasks and assessments into four levels. Unlike Bloom's Taxonomy (which categorizes types of thinking), DOK focuses on the depth of thinking required.

DOK is widely used to ensure that assessments match the cognitive demand of the standards they're measuring. Many state assessments are designed using DOK to ensure questions test deeper understanding, not just recall.

DOK 1 tasks require students to recall facts, definitions, or simple procedures. There is one correct answer, and the path to it is straightforward. Examples: define a vocabulary word, identify a state on a map, solve a basic computation, recall a date or name.

DOK 1 is necessary but not sufficient. Students need foundational knowledge, but instruction shouldn't stop here. If most of your questions are DOK 1, students aren't being challenged to think deeply.

DOK 2 tasks require some mental processing beyond recall. Students must make decisions about how to approach a problem, compare or classify information, or apply a concept to a new situation. Examples: explain the cause of an event, organize data into a chart, compare two characters, solve a multi-step word problem.

DOK 2 is where most classroom instruction should live. It requires students to use what they know rather than just remember it.

DOK 3 tasks require reasoning, planning, and justification. Students must think strategically and often have multiple valid approaches. Examples: design an experiment, write an argument with evidence, analyze a primary source for bias, solve a non-routine problem.

DOK 3 tasks take more time and cannot be answered with a simple response. They require students to explain their thinking, support claims with evidence, and consider multiple perspectives.

DOK 4 tasks require investigation, complex reasoning, and synthesis across multiple sources or disciplines over an extended period. Examples: conduct a research project, design and execute an experiment, create a multimedia presentation synthesizing multiple viewpoints.

DOK 4 tasks typically take days or weeks to complete. They are most common in project-based learning, research papers, and performance tasks. Not every lesson needs DOK 4, but units should build toward it.

DOK and Bloom's are related but measure different things. Bloom's categorizes the type of thinking (remember, analyze, create). DOK measures the depth and complexity of thinking required. A task can be at a high Bloom's level but low DOK (e.g., 'Create a list of vocabulary words' is Create on Bloom's but DOK 1).

Use Bloom's to write objectives (what students will do). Use DOK to check the cognitive demand (how deeply they'll think). Together, they ensure your instruction and assessment are both appropriately targeted.