Normative data and interrater reliability of the Design Fluency Test

This study generated normative data for the free and fixed conditions of th e Design Fluency Test (DFT; Jones-Gotman & Milner, 1977) and investigated i ts interrater reliability. Three raters independently scored DFT protocols from 66 normal adults according to criteria that have only recently been pu blished (Jones-Gotman, 1990; see Spreen & Strauss, 1998 for summary). Inter rater reliability was good to excellent for novel output scores and perseve rative errors, but nameable errors and designs with the incorrect number of lines yielded lower reliability coefficients. Overall, interrater reliabil ity of the DFT appears to be relatively good, especially for the free condi tion and, therefore, clinical use with adequate normative data may be justi fied.