Normative Data and Interrater Reliability of the Design Fluency Test

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Abstract
This study generated normative data for the free and fixed conditions of the Design Fluency Test (DFT; Jones-Gotman & Milner, 1977) and investigated its interrater reliability. Three raters independently scored DFT protocols from 66 normal adults according to criteria that have only recently been published (Jones-Gotman, 1990; see Spreen & Strauss, 1998 for summary). Interrater reliability was good to excellent for novel output scores and perseverative errors, but nameable errors and designs with the incorrect number of lines yielded lower reliability coefficients. Overall, interrater reliability of the DFT appears to be relatively good, especially for the free condition and, therefore, clinical use with adequate normative data may be justified.

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