The aim of this study was to contribute to our knowledge of the construct validity of the Griffiths Scales of Mental Development (Griffiths Scales) through an examination of the underlying dimensions tapped by the six subscales, using Common Factor Analysis. A sample of 430 South African children, from four ethnic groups (i. e. White, Mixed Race, Asian and Black) participated. The correlation coefficients obtained for the South African groups were compared to those Griffiths obtained in her work with the British standardization sample of the Griffiths Scales. The pattern of correlation for South African and British subjects was found to be similar. This suggests that the Scales are measuring a construct which is consistent across cultures and through time. A factor analysis was performed with the data for each South African ethnic group separately and the factor solutions were compared to determine whether the Griffiths Scales measure similar or different constructs for the groups. The results indicate that the Griffiths Scales tend to measure one factor, and including only common variables, the factor appears to be similar cross-culturally.

Since the introduction of the Griffiths Scales of Mental Development (Griffiths Scales) to South Africa, extensive research has been conducted in both clinical and educational settings. The measure is currently undergoing revision, with one of the objectives being to explore its psychometric properties, in particular its construct validity. The aim of this study was to examine the underlying dimensions tapped by subscales A, B, C, D, E and F for years 5, 6 and 7. The sample consisted of 180 children between the ages of 48 and 60 months, 60+ and 72 months, and 72+ and 84 months for years 5, 6 and 7 respectively. The variables of gender, cultural group and central nervous system development were controlled for. Underlying factors in each subscale were identified by means of factor analysis. The findings suggest that each subscale taps more than one construct and that constructs differ for the different age groups. This implies that in the revision process subscales for each of the years need to be investigated further with regard to their construct validity.

Screening measures aim to minimise the number of children being diagnosed incorrectly; however, many of these measures have been based on the "normal" white population. This study identified the need for a valid developmental assessment of black preschool children. The general aim of the study was to investigate the use of the Denver II and the Griffiths Scales on a pre-school black Xhosa-speaking sample. Specifically, the aim was to investigate the relationship between the Denver II Scales and the Griffiths Scales, in order to provide the first step in establishing the validity of the Denver II Scales on a South African black population. A correlational design was used and the sample was comprised of 60 Xhosa-speaking children between the ages of 3 and 6 years. The findings revealed that there was a significant relationship between the overall performance of the Denver II and the Griffiths Scales. However, the Personal-Social Scale of the Denver II appeared to have items that were culturally biased. Further, the Denver II further identified a higher percentage of the sample to have abnormal or questionable protocols than the Griffiths Scales did.

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