How should a clinician go about collecting the data when it doesn’t exist.

-The first step is deciding what condition it is that you are trying to diagnose. This may be response to a particular treatment.

-Second, make of list of what you think, or what the literature supports, as being related to the diagnosis.

-Next decide on how you are going to measure the diagnosis

-Finally, you must commit to measuring everyone on both the test variables and the gold standard.