We will think of data requirements using the following framework:
Noun Verb Object,
I did this.
We can also add context.
What nouns do we need to capture? What verbs? And so on. So if you want to capture that John Doe, a nurse at NoneSuch Hospital, used the defibrillator in a simulation 20 minutes after the simulated patient started to show signs of arrhythmia ...
Noun = John Doe
Verb = used
Object = the defibrillator
Context = in a simulated setting, at Nonesuch hospital, 20 minutes after the simulated patient showed signs of arrhythmia
We can capture requirements in a table that breaks it down by noun/verb/object, or we can capture statements that are examples of the kinds of data we want to capture.
See sample statements.
See Gap Analysis from Tom Creighton.