Individuals with Autism Spectrum Disorder (ASD) often engage in stereotypical behaviors. In some individuals these behaviors occur with very high frequency and can be disruptive and at times selfinjurious. We propose a system that can tacitly collect contextual data related to the individual's physiological state and their external environment, and map it to occurrences of stereotypies. A user study was conducted with children with ASD, parents, and caregivers to explore and validate this concept. A prototype of the system, developed through participatory design, was used in the study as a probe to elicit the information needs of these stakeholders, and provide a better understanding of the nuances involved in supporting those needs. Here we present the findings of this study, and four design recommendations; promoting ecological integration, addressing privacy concerns, supporting inference, and enabling customization.