This study investigated whether modifying a career development course (CDC) format by means of simpler written materials, more illustrations, and the addition of an audio tape recording could improve the CDC as a training device for basic job information, especially with airmen having minimum verbal skills. High, middle, and low aptitude personnel studied three versions of the CDC for the 57130 (Fire Protection) career ladder. Versions included a conventional CDC, a less verbal CDC with more pictorial materials, and a less verbal CDC with more pictorial materials accompanied by a tape recording of information complementary to that contained in the written CDC text. Data were collected on learning performance, reading speeds, and attitudes toward the CDCs. The analyses revealed that the modified CDC with the audio supplement produced significantly increased learning scores. High and middle aptitude groups consistently outperformed the low aptitude groups across all CDCs. (The report includes sample CDC pages, measurement instruments, and results of analysis of variance, followed by 20 references and 16 tables and figures.) (Author/LY)