Reported is an evaluation study involving learning disabled (LD) children (6 to 13 years old) in 23 LD programs in which children with successful outcomes were compared to children with unsuccessful outcomes. Among conclusions discussed are that Ss in the successful outcome group did not differ from those in the unsuccessful outcome group in age, ability level, or academic attainment when they entered the LD program; and that the unsuccessful group displayed more specific disabilities which were rated as more severe than those of the successful group. It is noted that the formative evaluation model discussed in the document considers the interaction of programmatic components with each child's individual characteristics, covering antecedent, transaction, and outcome variables. (IM)