The purpose of this study was to assess the immediate and delayed effectiveness of Systematic Training for Effective Parenting (STEP), an Adlerian-based parent study group programme. STEP is a nine-session, multi-media package which combines communication skills with basic Adlerian principles. The focus of the study was the parents. The dependent variables were: parents' perceptions of their Target Children's behaviour; parents' knowledge of an Adlerian approach to child-rearing; and parental perceptions of their own behaviour and feelings. Measurement of the dependent variables was by the use of the following instruments: the Adlerian Parent Assessment of Child Behavior Scale (APACBS), a 32-item interval scale developed to assess parents' perceptions of typical child behaviours dealt with in the STEP programme; the STEP Questionnaire, a cognitively-based questionnaire based on the content component of the STEP programme; and individual interviews held with the mothers in the Experimental (STEP) Group. The Pretest-Posttest Control Group Design was used in the study. Both the parents in the STEP and Control Groups were either clients or potential clients of an Educational Clinic, or had been referred by a School Counsellor. The STEP programme was run with strict adherence to materials and format by the researcher. Measurements were taken immediately following the completion of the programme and again 14 weeks later. Results indicated significant positive short- and longterm changes in parental perceptions of their children's behaviour as measured by APACBS after involvement in a STEP programme. Short- and long-term changes also occurred in the parents' knowledge of an Adlerian approach to childrearing as measured by the STEP Questionnaire. The STEP Group mothers reported changes in their behaviour and feelings following participation in a STEP programme. Some recommendations for further research are: replication of the study with various populations; studies measuring actual observed behaviour of the child, and the parent; effects of STEP as a minor strand or part of an ongoing parent education programme; the effects of varying levels of skills of leaders; and the incorporation of video cassette recordings of the audio tapes in the STEP kit.