The aim of this study was to probe the validity of the Training and Assessment of Relational Precursors and Abilities (TARPA) as a protocol for the measurement of relational skills underlying language in typically developing children. Seven children (5 girls and 2 boys aged 2-6 years) completed the visual-visual range of the TARPA at Time 1. Six of these children were re-assessed with the same protocol at Time 2. The Social Maturity Scale (S-M) was administered to the children' caregivers. Results showed a significant correlation between performance on the TARPA and the Communication sub-scale of the S-M at Time 1. This result supports the use of the TARPA visual-visual range as a protocol for measuring responding critical to the development of generative verbal behavior. However, TARPA performances at Time 2 departed somewhat from our prediction. The latter patterns are discussed, together with implications for future testing and development of the protocol.
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