The term "I'll know it when I see it" applies to one valid way to get requirements definition.

Question

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This statement means that the person does not have a clear idea of what they want or need, but will recognize it once they see it. This approach can be used to gather requirements from stakeholders who may not be able to articulate their needs in a clear and concise way. However, it can also be risky as it relies on subjective interpretation and can lead to unclear or constantly changing requirements.

The Term "I'll Know It When I See It" Applies