Table 1.

Contextual issues that may influence content validity

Original CPS context	Current multidisciplinary oncology context
Few treatment choices	Many treatment choices with no clear survival advantage
Urgency for treatment decision	Men with slowly progressing cancers may extend decision-making time
Patient had single doctor	Not unusual for patients to consult several specialists
Doctor main source of information	Wide access to internet and other cancer information sources
Little consumer participation in health care	Norm of patient involvement; doctor may refuse control of decision