The validity of the Cognitive Assessment System (CAS) as a fair diagnostic instrument in South African schools

M.Ed. (Educational Psychology)Diversity is an important component of the South African society. Traditional standardised methods of assessment have been discouraged or abandoned. as they have been found to be discriminatory. Arguing for a systematic assessment process, Siegel (1999:307) states that the standardised methods are the best way to achieve understanding as to the reasons for the breakdown in Iearning and ensure effective intervention. The objective of this study was therefore to establish whether the Cognitive Assessment System (CAS), a cognitive assessment tool, correlates and is a predictor of achievement in the South African context. In order to examine the validity of this claim. I selected 32 black, Grade 6 learners, from a school In 8 Northern Johannesburg suburb, to determine whether the scores obtained on the CAS, correlate and predict achievement in the areas of reading and scholastic work. The quantitative research Involved identifying correlations between three data areas, the CAS. Woodcock Diagnostic Reading Battery (WDRB). and the scholastic marks obtained from school subjects for December 2000 and June 2001. As a result of this research and data analysis. high correlations were obtained between the three data areas. In addition the achieved scores of the WDRB were found to correlate with predicted scores taken from the learner's CAS Full Scale score. It was therefore concluded, that the Full Scale score of the CAS is predictive of achievement as measured by the six sub-tests taken from the WDRB. The findings of this study thus indicate that the CAS cognitive assessment tool could. within certain limitations, be used in the South African context to improve diagnostic interpretations and subsequent interventions. The challenge remains for additional research to be undertaken to explore the diagnostic value of the CAS in the wider community