The text explicitly states that if one intervention is going to impact another intervention you might want to avoid an alternating treatment design because theyre going to rapidly be following each other An alternating treatment design also known as a multielement design involves the rapid alternation of two or more distinct interventions within a single experimental phase often presented in a randomized or counterbalanced sequence While this design is highly efficient for comparing the relative effectiveness of multiple treatments its primary limitation as highlighted in the text is its susceptibility to multiple treatment interference or carryover effects This occurs when the effects of one intervention condition extend into the subsequent condition making it difficult to isolate the true impact of each individual intervention Such carryover can obscure the functional relation between the intervention and the target behavior thereby compromising internal validity In contrast a multiple baseline design Option A across settings individuals or behaviors is often preferred when carryover effects are a concern or when a withdrawal of treatment as in a reversal design Option B is impractical or unethical A changing criterion design Option D is used for behaviors that are already in the clients repertoire and can be gradually modified