For example, the evaluators may not have selected the sites appropriately for the generalizability needed or they may have collected minimal information with little depth of inquiry.
Evaluators might not have picked the sites well.
Evaluators might not have picked the sites at all.
A man is in the desert.
A couple of men and woman singing
Men watching a baseball game.
The children are inside watching TV.
Aubrey Robertson lives in Los Angeles and rarely bothers to lock his door at night.
Possible solutions, but not set in stone.