Can the forms be used outside their designated age ranges?

Answer: For adults who are a year younger or older than the designated age range, there will not be much error in using the forms and their norms. However, the greater the deviation in age from the norms, the less appropriate the norms will be. If people are to be reassessed over periods that are mainly within the age range designated for the adult forms but that include one or two assessments that are within about a year below or above the designated age range, it may be better to use the adult forms at all assessment points to maintain complete continuity of item and scale scores, rather than using instruments designated for younger or older ages.