The effectiveness of a workbook for training creative thinking, "Thinking Creatively: A Guide to Training Imagination," was evaluated with a sample of 198 inner-city students. The materials seek to teach attitudes which predispose an individual to behave more creatively and techniques for producing new combinations of ideas. Two sixth-grade classes (one from a low- and one from a medium-ability school) and two eighth-grade classes (one low- and one medium-ability) served as experimental groups. Four similar classes comprised the control groups. Three subtests from the Torrance Tests of Creative Thinking were administered to all subjects (Ss) as pretests. After about four weeks of training (one class hour on each of about 20 days), another form of the Torrance Test was given, along with a 20-item attitude questionnaire for all Ss, plus two other instruments just for students and teachers in experimental classes. Despite the finding that both the training materials and the testing instruments were difficult for many of the Ss to read and thoroughly comprehend, most students and teachers felt that students had benefited from the creativity training experience. Two experimental classes showed modest gains in Torrance Test scores. (Author/JM)