Hidden Assumption
A belief that an analyst is treating as load-bearing in a thesis without realizing it -- often a stickiness, durability, or relationship claim that the analyst absorbed from management without independent verification. The pre-mortem is the exercise that most reliably surfaces hidden assumptions, because the retrospective failure story forces the analyst to identify which assumptions broke. Examples: \"customers were stickier than industry norms because of dedicated equipment\" was a hidden assumption when the analyst had only the management quote as evidence.
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