Objectives and design: National guidelines emphasise the need to enhance arm and hand recovery poststroke. OnTrack is a 12-week package aiming to address this need. Feasibility was evaluated in a single-arm feasibility study (reported separately). This paper presents findings from a nested process evaluation. The objectives were to explore users’ experiences of OnTrack and fidelity of delivery, in order to inform a definitive trial of effectiveness and future delivery. Setting: Participants were interviewed in a range of settings in hospital, home or via telephone, at the end of their intervention cycle. Session observations for a selection of coaching sessions were carried out in person at home or remotely, post-COVID-19. Participants: Eleven participants who completed the intervention following a stroke were interviewed. Seven coaching sessions were observed. Intervention: This process evaluation was part of a larger feasibility study of OnTrack, which involves setting movement targets and monitoring activity using a tracker on the wrist, motivational messaging via a Smartphone and self-management coaching. Preliminary analysis of data collected was conducted with a public and patient involvement group formed of stroke survivors. This informed changes in intervention delivery. Results: Participants reported finding the OnTrack programme beneficial, with the coaching role seen as particularly important. Participants found activity tracking motivating, but some noted discrepancies between tracked movement and what they considered useful activity. Motivational messages were sometimes irritating. Most felt ready to sustain their own activity practice at the end of the programme. Conclusions: This process evaluation supported initial theoretical assumptions that OnTrack would enable activity practice through the use of remote monitoring. There was a strong emphasis on the coaching role as a mechanism of impact supporting the technological intervention. These findings will inform the next stages of delivery in a definitive trial. Trial registration number: NCT03944486.

** Embargo end date: 19-08-2023
** From BMJ via Jisc Publications Router
** History: received 17-02-2022;
accepted 02-08-2022;
ppub 08-2023;
epub 19-08-2023.
** Licence for this article starting on 19-08-2023: http://creativecommons.org/licenses/by-nc/4.0/
** Acknowledgements: Daniel Dickens oversaw the project along with Lord Ara Darzi. Lily Hoskin supported development of the intervention. Gianpaolo Fusari, Ella Gibbs and Fiona Jones initiated the study design and Elizabeth Taylor and Melanie Leis helped with further refinement. Anna Lawrence-Jones led on PPI. Ella Gibbs and Gianpaolo Fusari were responsible for the delivery of the intervention and data collection for the feasibility study. Jennifer Crow oversaw participant screening. Melanie Leis and Roberto Fernandez Crespo conducted statistical analysis for the feasibility study. The authors would like to acknowledge the contributions of all the members of the PPI group and all participants involved, as well as the therapists who helped with recruitment of participants, and all those involved in the OnTrack study.