There were two arms of recruitment for this study: NHS and non-NHS.

- NHS participants were recruited from 16 NHS sites across England and Wales with support from the NIHR Clinical Research Network. Participants from NHS services with a diagnosis of schizophrenia spectrum disorder or eligibility for Early Intervention in Psychosis services were approached by local research teams and offered study participation. 
- Non-NHS participants were recruited through advertisements with mental health charities. Participants were required to have recent experience of distressing psychosis to be eligible for the study. 
- Both NHS and non-NHS participants were required to be 18 years old or above, and understand English language well enough to comprehend study materials.

Once participants agreed to take part, they completed the questionnaires either via REDCAP or paper copy. Paper copy results were then entered manually into REDCAP. Participants completed 'Survey 1', involving DiPS, SCS-SF, ISMI-9, R-GPTS, and HPSVQ at time point 1. A subset of participants then completed 'Survey 2' (DiPS for a second time) at time point 2.