Table 3. Summary of feasibility study variables and data sources.

Outcome variables	Variable description/definition	Data source (and data type1,2)	Data collection timeframe
Objective 1a: monitor respondents to the outreach strategies and describe IAC visitors
Respondents to outreach strategies	The proportion of individuals/organizations who respond to each outreach strategy used to promote the IAC (e.g., % of GPs who received the promotional video about the IAC and subsequently referred older adults or % of hospitals who referred older adults to the IAC after an outreach meeting)	• IAC administrative data1 • IAC administrative data1	• Weekly
Number of visitors and appointments	The total number of visitors to the IAC or home-based appointments, and the number of appointments
Reason for appointment/ contacting the IAC and referral source	The primary reason for contacting the IAC/booking an appointment and the source of referral for each older adult who visits the IAC
Type of service received by visitors	The number of older adults who during their IAC appointment receive either a) health promotion and prevention as well as social and financial support; b) a full CGA; c) a brief assessment to confirm whether a nursing home referral is warranted; or d) other
Objective 1b: assess the implementation outcomes and processes
Implementation outcomes (i.e., essential proximal outcomes to assess within the overall system before we can measure effectiveness outcomes [43])
Adoption	The intention or action of the IAC staff to employ the care model [45]*, which will be determined through the researchers’ perceptions during the meetings with IAC staff and the staffs’ documentation in the IAC health record.	• IAC staff meeting log2 • IAC health record1	• Regular meetings will be held with the IAC staff
Acceptability	The perception among IAC staff and service users that the care model is agreeable [45]*.	• IAC staff meeting log2 • Older adults & informal caregiver interviews2	• Regular meetings will be held with the IAC staff • Interviews will be held within two-weeks of second appointment
Feasibility	The extent to which the care model can be successfully implemented within the IAC of the care region [45]*. Feasibility will be assessed for each component of the care model and overall.	• IAC staff meeting log2 • Older adults & informal caregiver interviews2
Fidelity	The degree to which the core components of the care model is implemented according to protocol [45]*, largely based on the assessments conducted.	• IAC health record1 • IAC staff meeting log2	• Weekly and at the end of the study
Implementation processes
Implementation processes–collaboration	The implementation processes related to collaboration between IAC staff and external health and social care professionals to coordinate care for an older adult [46]. This will be captured from the perspective of the external professionals who collaborate with the IAC staff.	• The Normalization MeAsure Development questionnaire (NoMAD 1) [46]	• Towards the end of the study
Objective 2: assess implementation costs
Implementation costs (i.e., costs related to the implementation strategies)	The time-driven activity-based cost related to the planning and delivery of implementation strategies [32]	• IAC administrative data1 and INSPIRE document-ation1	• Daily

¹ Quantitative;

² Qualitative;

* Definitions adapted from Proctor et al. (2011)