Table 2.

Intervention Characteristics: determinants, tailoring, and identification of key aspects for implementation planning.

Construct and study results	Considerations regarding determinants	Tailoring and key aspects
Intervention Source: intervention considered as internally developed	Facilitator: the involvement in the development study [41] and this study may promote ownership to the intervention, which may support intervention implementation.	Key aspect: ownership
Relative Advantage: the intervention as an advantage to current practice	Facilitator: HCPsa pointed to aspects perceived to be advantages of the intervention. This may be considered as a positive attitude to what is being implemented.	Key aspect: a positive attitude to implement the intervention
Adaptability: use of existing system	Facilitator: participants perceived the previous integration of InvolveMe in a patient portal to be beneficial. This may support acceptance and adoption	Key aspect: system acceptance and adoption
Adaptability: a new work task; the secure assessment feature	Barrier: The assessment was a new work task for HCPs, which caused a concern for increased workload and potentially increased time pressure on consultations.	Tailoring: the assessment feature was condensed to a brief list and refinement was made to the summary
Trialability: a need to test before the clinical trial	Barrier: HCPs highlighted that a pilot study would be important to test the intervention and the implementation strategies. A test of the intervention would also inform HCPs that were not formerly involved in the research project and potentially address concerns in advance.	Tailoring: decision, agreed upon by all parties involved, to conduct a pilot study
Complexity: lack of integration between EPRb and patient portal	Barrier: it was recognized as important to improve accessibility and avoid paper printouts of the assessment summary.	Tailoring: the summary was created in a format that could be copied and pasted from the patient portal and into the EPR
Complexity: messages sent directly to the physicians	Barrier: it was considered important to tailor the intervention to suit the physician’s clinical workflow to succeed with intervention implementation.	Tailoring: a shared email inbox with a dedicated triage moderator was established

^aHCP: health care provider.

^bEPR: electronic patient record.