Sometimes, however, it is not possible to answer the evaluation question using case studies, if the program is diverse and the user needs national generalizability.
Case studies are not sufficient when the program is diverse.
Case studies are always sufficient to answer the evaluation question.
A white kitten is swimming in the water.
A street vendor is selling hot dogs.
A man is playing an instrument.
It was a legitimate business.
Fewer than three possibilities were open.
An Arabic man is wearing a hat.