Inconsistent terminology, limited goal descriptions, and poor documentation of patient involvement’s use and influence have made it challenging to evaluate their impact. Despite this, the need to evaluate the impact of patient involvement is increasingly recognised, especially to improve practice. Evaluation has been used to determine if and how patient insights were integrated into assessment reports, and if the presence of written patient statements are associated with positive reimbursement decisions. It has also been used to assess the impact of written statements (Mason et al. 2020). The number of sources of evidence and variables in an HTA make such evaluations problematic. An alternative approach to understanding the impact of patient involvement in HTA is case studies in the form of stories (for example, as described by Single et al. 2019). The PCIG has developed this work using their Patient Involvement Impact Perspectives template (see Stakeholders perspectives of impact of patient involvement in HTA (Impact Project)) to collect further case studies or stakeholders’ experiences of patient involvement in HTA. Such information could provide reflections on the perceived impact of patient involvement from the perspective of anyone involved in an HTA, including patients and people working in HTA or industry.