Children bring different levels of social competencies into peer-based group collaboration and play. Assessing these in children ages 4-7 is important for understanding students’ social emotional strengths and weaknesses and designing relevant treatment programs. GPS is a qualitative, observation-based assessment tool to help professionals evaluate the peer-based play abilities of children as part of their dynamic social assessment. Useful to IEP teams (parents too) in generating definable social learning goals and objectives, GPS is also a tool for researchers.