Table 2.

Design objectives, intervention features, and background literature or theory linked to the guiding principles.

Design objectives	Intervention features	BCTa or previous literature
To ensure that the intervention is accessible for people with lower levels of health literacy	Ensure that the site and content are accessible and understandable Reduce complexity and jargon to enable the personal use of information Provide options to support users to apply relevant information and put advice into practice	Integrated model of health literacy [47]
To enable people with joint pain to gain advice and support that is relevant to them at different times	Integration of web and community resources to provide information and advice when it is required Links to community resources to connect web information with real-world application	Integrated theory of health behavior change [48]
To encourage people with joint pain to think about and engage with support in terms of their wider social network	Integration of the GENIEb tool with the new joint pain self-management tool (EMPOWERc) Ensure that the benefits of social network support are highlighted	Integrated theory of health behavior change [48]
To develop an approach that recognizes joint pain as the rationale for seeking support	Ensure features and navigation through the sites that recognize joint pain as the motivation for accessing the intervention	Self-determination theory (extrinsic motivation—identified regulation) [49,50]
To encourage people to set goals to promote action and maintenance of self-management behaviors	Promote the creation of goals from information on the sites to develop behaviors for managing joint pain	Health action process approach [51] Goal setting theory [52,53]
To ensure that users consider the intervention to be trustworthy	Provide references for all information Provide information about the development of the intervention by people with joint pain, researchers, and health care professionals	No specific BCT but background on trust and reputational mechanisms [54,55]

^aBCT: behavior change theory.

^bGENIE: Generating Engagement in Network Involvement.

^cEMPOWER: Managing joint Pain On the Web and through Resources.