This technique restates the problem questions Who? What? Where? When? Why? and How? to define the problem.
The usage of this technique is very broad. Use the 5W1H technique to generate problem definitions. When considering the problem, stay focused and challenge your assumptions. Always ask: Is this the essential problem? Is this the core of what we want to solve?
Executing the Method

Restate Problem
State the problem in the form of: ‘In what ways might…?” For example, the problem might be the rising level of pollution in urban areas. Restating this problem would result in: “In what ways might we reduce urban pollution?”.

List 5W1H
Under this statement, write down the Who? What? Where? When? Why? and How? questions.

Apply the Questions to the Problem
These questions consider the problem, so for example: Who has the problem? Where is the problem? And so forth.

Leave Space
Leave a little room under each of these questions, so you can put postits under it.

Write down Responses
Write your response to these questions on postits, and put these under each question.

Keep Going
Continue until you can’t come up with new responses.

Combine Responses
Combine the responses for each question to generate new problem definitions.