The purpose of this investigation was to evaluate an organizational diagnosis program that (a) commenced with the assessment of managerial communication skills and (b) provided the frame for follow-up training programs. Two groups of managers (N = 96) participated in diagnostic assessment activities to evaluate their communication skills. One group of managers (N = 48) then received follow-up communication skills training based on their assessed performance. Managers participating in communication skills training received significantly higher performance ratings on interpersonal skills, problem-solving ability, and productivity over three long-term assessments. Implications of these findings are discussed for corporate training programs and instructional development more generally.