Table 1. Eligibility criteria for the review.

Criterion	Inclusion	Exclusion	Justification
Population	All populations involved in health care research are relevant. This could include healthcare professionals, implementation researchers, and other people who plan, provide and/or use health services.	Other populations.	Focus of the research programme is healthcare interventions. Extending beyond healthcare would be unmanageable with review resources.
Concept	Commentaries or editorials/opinion pieces which discuss how tailoring should be done and/or why (objective 1) Primary studies that use a tailoring process to prospectively select implementation strategies prior to deployment in healthcare or tailoring of a strategy to fit with different population subgroups (objectives 1-3)	Studies adapting implementation strategies to emergent barriers after deployment.	The aim of the review is to inform priorities for a research programme on prospective tailoring to develop strategies to support the adoption and implementation of healthcare interventions.
Context	Studies which use a tailoring process to develop strategies (methods or techniques used to enhance the adoption, implementation, and sustainment of a clinical program or practice), for application in healthcare settings *	Studies using tailoring outside of the healthcare context. For example educational settings.	Focus of the research programme is healthcare interventions. Extending the review beyond healthcare would be unmanageable with the resources available for the review.
Language	English	Non-English	Reviewers are only English speaking and do not have the resources to translate articles to other languages.
Time period	Year 2005 – 2022	Before 2005	Given the breadth of the search, and to manage resources, the decision was made to focus on over 17 years of literature. The flagship journal in the field, Implementation Science started in 2006, signaling the formal establishment of the field in 2006 and subsequently, dedicated journals, including Implementation Science Communications (2020), Implementation Research and Practice (2020), and Global Implementation Research and Applications (2021) have been established.
Types of articles	1.   Peer reviewed journal articles of primary studies    2.   Unpublished (grey literature) including theses/dissertations, and book chapters, toolkits, guidance, reports.    3.   Study protocols    4.   Editorial/opinion pieces will be used as source of additional articles and to address objective 1	•   Conference abstracts    •   Non-peer reviewed sources (i.e., presentations, websites, blogs, studies in progress)	Aim to capture more than peer reviewed literature to fully understand how tailoring has been conducted in practice.
Geographic	Any location	None	Tailoring implementation strategies has application globally.

*state-funded and private organisations providing services in the following areas: disability, older persons, nursing homes, acute and non-acute hospitals, community hospitals, mental health, social inclusion, palliative care, chronic illness, primary care (GP, dental, pharmacies, physiotherapy clinics), health and wellbeing, hospice, rehabilitation, home care, paramedics, and community services (e.g. youth, substance abuse, suicide prevention, community development)” ³⁰ .