Table 1 Overview of process evaluation objectives and methods used in the Plants for Joints (PFJ) process evaluation

Domain 1: Context

Reach

1

Characteristics of participants who signed up for PFJ

x

x

2

Characteristics of coaches who delivered PFJ

x

Domain 2: Implementation

Recruitment

3

How participants heard about the PFJ intervention

x

x

4

Participants' reported motivation to join PFJ, including barriers and facilitators to sign-up

x

x

5

How coaches were approached to take part in PFJ

x

6

Coaches' motivation to join PFJ

x

7

Participants' experiences with the intervention before the it started, including provision of information, expectation management, starting directly or waiting to start (control group)

x

Delivery

8

Number of group sessions attended by participants (dosage)

x

9

Amount of intervention tools used by participants (dose received)

x

10

Participants' views of the extent to which they were stimulated to use behavioral change techniques by coaches (dose-delivered)

x

11

Coaches' views of the extent to which participants were stimulated to use behavioral change techniques (dose-delivered)

x

12

Coaches' views of the extent to which they delivered PFJ as planned/ instructed (fidelity)

x

Domain 3: Mechanisms of impact

Responsiveness

13

Participants' views and experiences of the tools and behavior change techniques provided during the (specific) group sessions, group setting and dynamic, feasibility, and guidance and coaching

x

x

14

Coaches' views and experiences of the instructions (training) received and preparation, tools and behavior change techniques used, (specific) group sessions, group setting and dynamic, and their delivered guidance and coaching

x

15

Participants' overall satisfaction of the intervention

x

x

16

Participants' perceived impact of the intervention on the ability to make short- and long-term lifestyle change(s)

x

x

17

Participants' perceived social support and impact of the intervention on the social environment

x

x

Domain 4: Facilitators and barriers

18

Coaches' perceived barriers and facilitators to implementing PFJ

x