Innovation platforms bring together diverse stakeholders to exchange ideas about addressing challenging problems. The inherent complex nature of innovation platforms poses challenges for evaluators, and although it is recommended that multiple evaluation methods be used, this is not commonly done in practice. In this study we used a methodologically pluralist approach to evaluate and iteratively refine an innovation platform to strengthen primary health care for Aboriginal and Torres Strait Islander Australians. The pluralist design used four evaluation approaches—developmental evaluation, principles-focused evaluation, network analysis, and framework analysis.