1. One necessary facet of measuring a behavior via permanent product is: the permanent product can only be produced by the target behavior. Anotheraspect is:

a. a target behavior measured by permanent product requires additional resources

b. each occurrence of the target behavior must produce the same permanent product

c. a target measured by permanent product requires constant observation but not continuous measurement

d. measurement by permanent product is usually acquired in real time

2. When a timing procedure is used to record an observation, the most stringent method of IOA would be:

a. exact count per interval

b. total duration of occurrence

c. total count per interval

d. mean duration per occurrence