The use of single-system evaluations in entire agencies largely can avoid the imposition of outside researchers coming to evaluate your work. Because clients and others are intrinsically involved in...

The use of single-system evaluations in entire agencies largely can avoid the imposition of outside researchers coming to evaluate your work. Because clients and others are intrinsically involved in constructing and implementing single-system designs, there is a high level of intellectual and professional honesty in their use. The closeness of the measures to the client’s problems produces a type of validity that cannot be matched in group designs.