Home-school partnerships in special education often include parent advocacy that at times requires specific and specialized knowledge, skills, and attitudes. Parent participation is shaped by access to cultural and social capital resources and is critical to assessment and service delivery. This study explores the types of capital resources parents perceived necessary to their participation via five focus groups of participants from a range of socioeconomic, disability, and racial or ethnic backgrounds through 27 in-depth interviews. NVIVO7 was used to analyze data; categorical meaning and relational themes were coded recursively. Results indicated that intercultural and intracultural differences existed among parents. Advocacy on behalf of one student also required different capital resources than did advocacy for systems change. Discussion focuses on implications of parent advocacy on educational equity. (Contains 1 table.)