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The purpose of this study was to evaluate the psychometric properties of 2 novel measures assessing personal advocacy, self-efficacy and personal advocacy activities in individuals with acquired brain injury (ABI). This was an instrument development study using (a) expert panel review with a content validity index,(b) consumer survey, and (c) Rasch analysis. Participants were adults (N= 162) with ABI recruited through a community survey. Participants completed the Self-Advocacy Scale (SAS) and the Personal Advocacy Activity Scale (PAAS). Using Rasch analysis to inform instrument development, after modification on the basis of item response theory analysis, the SAS, a measure of advocacy self-efficacy, was found to be unidimensional with an eigenvalue of 1.6, exhibited monotonicity, and had an item reliability of 0.97. Similarly, the PAAS, a …