Abstract The purpose of this descriptive study was to develop and evaluate “Moms on the Move,” a provider-counseled physical activity intervention for mothers enrolled in the Women, Infants, and Children (WIC) program. The intervention was based on the Transtheoretical Model (TTM) of behavior change. The evaluation occurred in two stages. In the first stage, physical activity behavioral experts (n=4) evaluated the: (a) rationale for intervention components; (b) linkages between behavior change constructs, intervention activities, and study outcomes; (c) literature support for the TTM behavior change constructs; and (d) the intervention brochure. The expert evaluation tool was adapted from the “Educational Materials Review Form.” Each item in the expert evaluation met the ≤ 3.0 mean criterion for acceptability (range, 1.33–2.67). Revisions were made based on expert comments before stage 2. In the second stage, WIC mothers (n=5) evaluated the intervention brochure. The 9-item WIC mothers' evaluation tool was adapted from a simple tool for community members. In the second stage evaluation, the mean total score for the intervention brochure evaluation was 44.0 (SD=1.22), which met the a priori criterion to retain as is. Mean item responses ranged from 4.8 to 5.0 (5.0=great). This evaluation indicates that “Moms on the Move” is a promising physical activity intervention for WIC mothers, which should be implemented for efficacy testing.