A research study investigated the relationship between personal characteristics and selected demographic data of 75 attendants in a mental retardation developmental center and the assessment by 24 administrators of the attendants' job performance. Instruments used included a 20-item Direct Care Performance Scale and the Demographic Data Scale, which collected information in 8 areas: work experience, civic and community involvement, educational level, sex, age, marital status, home environment, and birth order. Also used was the Sixteen Personality Factor Questionnaire comprised of 105 forced-choice questions. The variable "years of work experience" derived from the Demographic Data Scale was found to be the most significant independent variable in predicting attendants' job performance. Significant relationships were found between job performance and personality factors of conservative, stable, suspicious, relaxed, and practical. Appended are 12 references and 3 tables of the statistical measures used to analyze the data: analysis of variance, stepwise multiple regression, and analysis of covariance. (MLF)