Workbook for Reasoning Skills. The "yellow" book is packed with exercises that emphasize the real-world situations, problem solving, reasoning, and comprehension. Interesting exercises test cognitive flexibility and tap critical and creative thinking. Written for adolescents and adults, with mild to moderate impairments the exercises are easily adaptable for many populations and uses. Workbook for Cognitive Skills. Designed for adults and adolescents with aphasia, cognitive impairments, or word/memory loss.A Clues Book provides help for those who cannot spell, need practice scanning, or require assistance finding an answer.