This article addresses a lack of attention in the implementation science
literature regarding how to overcome recruitment and retention challenges in
longitudinal studies involving large samples of service agencies and health
service providers (“providers”). Herein, we provide a
case-illustration of procedures that improved recruitment and retention in a
longitudinal, mixed-method study—Project Interprofessional Collaboration
Implementation—funded by the US National Institute of Mental Health.
Project Interprofessional Collaboration Implementation included counselors,
program workers, educators, and supervisors. We present a research-engagement
model to overcome barriers that included developing a low-burden study, social
gatherings to engage stakeholders, protocols to recruit agencies and providers,
comprehensive record-keeping, research procedures as incentives to
participation, a plan to retain hard-to-reach participants, and strategies for
modifying incentives over time. Using our model, we retained 36 agencies over
the life of the project. Between baseline (N = 379) and 12-month follow-up (N =
285), we retained 75% of the sample and between the 12- (N = 285) and 24-month
follow-ups (N = 256), we retained 90%. For qualitative interviews (between
baseline and 12-month follow-up and between 12- and 24-month follow-ups), we
retained 100% of the sample (N = 20). We provide a summary of frequency of
contacts required to initiate data collection and time required for data
collection. The model responded to environmental changes in policy and
priorities that would not have been achievable without the expertise of
community partners. To recruit and retain large samples longitudinally,
researchers must strategically engage community partners. The strategies
imbedded in our model can be performed with moderate levels of effort and human
resources. Creating opportunities for research partners to participate in all
phases of the research cycle is recommended, which can help build research
capacity for future research.