Table 1 Framework for intervention design
Component of intervention design co-design partners | Co-design partners |
|---|---|
Step 1: Formative research | |
 1.1. Survey to assess mobile phone use following stroke | People with stroke |
  1.2. Review of the scientific evidence    a. Barriers and facilitators for physical activity after stroke    b. National and international guidelines for rehabilitation and physical activity following stroke    c. Tailoring text message interventions for the target group | Core Research Team (CRT) |
  1.3. Clarifying what people with stroke want/need from an intervention    a. Addressing perceived gaps in services    b. Ensuring continuity from rehabilitation    c. Building on rehabilitation goals    d. Exploring what input would be helpful in an intervention | Collaborative Working Group (CWG) |
  1.4. Interviews with community-dwelling people with stroke to assess:    a. Acceptability of a text message intervention post-rehabilitation    b. Useful content for the intervention    c. Design features to tailor the intervention to the target group | Community-dwelling people with stroke |
  1. 5. Identify theoretical models for behaviour change | CRT |
Step 2: Design of the text message intervention | |
 2.1. Defining intervention content   a. Map out components of the intervention, using theoretical models   b. Identify salient behaviour change techniques (BCTs)   c. Tailor the intervention to the needs of people with stroke   d. Create an initial bank of messages based on step 1 data | CRT |
 2.2. Refining the content and form of delivery for people with stroke   a. Giving a voice to people with stroke within the messages   b. Incorporating recommended guidelines for post-stroke activity   c. Recommendations on use of online resources | CWG PPI group |
 2.3. Creating draft 1 of the text message intervention   a. Organising messages into a sequence for delivery following the Health Action Process Approach (HAPA) and the maintenance model   b. Creating a delivery plan for the intervention   c. Ensuring messages are coherent and deliver the intervention | CRT |
Step 3: Pretest the intervention concept and messages | |
 3.1. Review draft 1 to ensure components of the intervention are addressed and behaviour change techniques are incorporated | CRT |
 3.2. Revision of messages and delivery plan (draft 2) | CRT |
 3.3. Review of draft 2 to ensure readability for people with cognitive and visual processing difficulties | Speech and language expert |
 3.4. Review of draft 2 to assess acceptability of content and delivery schedule, identify gaps in the intervention, ensure that messages are engaging, understandable, interesting and informative | CWG, people with Stroke, other volunteers |
Step 4: Final revisions | |
 4.1. Review and final revisions to the intervention   a. Collate all feedback from step 3   b. Create final version of the text message intervention and delivery plan for pilot testing | CRT |