Definition: Extended description of the protocol, including more technical information (as compared to the Brief Summary), if desired. Do not include the entire protocol; do not duplicate information recorded in other data elements, such as Eligibility Criteria or outcome measures.

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Background and Significance: Strong evidence supports testing for the high risk human papillomavirus (HPV) infection, the etiology agent of cervical cancer, in routine cervical cancer screening. In 2014, the FDA approved the first test for primary HPV screening. Between 2015 and 2017, professional societies and national guideline bodies released practice recommendation for primary HPV screening. However, none of the large health care systems in the U.S. have systematically adopted this new screening strategy. Kaiser Permanente Southern California (KPSC) is preparing to transition to primary HPV screening in 2019, with considerable expected impact and barriers at multiple levels. There is a critical gap of knowledge on effective strategies to guide implementation of uptake of new evidence-based practice, especially around cancer screening where changes to clinical practice guidelines often created confusion among clinicians and patients. The overarching goals of this application is to generate insights and evidence regarding barriers and facilitators and effective strategies to achieve clinical practice substitution. Study Aims: SA1) Compare a local-tailored vs. a centralized approach for facilitating adoption of primary HPV testing for cervical cancer screening on (a) implementation outcomes including uptake of primary HPV screening, acceptability, appropriateness and feasibility; and (b) stakeholder-centered outcomes including knowledge, experience, behavior and satisfaction; SA2) Explain variations in implementation strategy effectiveness on study outcomes by multi-level factors; and SA3) Develop guidance for use of the effective implementation strategies in additional settings and for additional implementation problems. Study Descriptions: We will conduct a prospective, cluster randomized programmatic trial to compare and evaluate a local-tailored versus a centralized implementation approach. The local tailoring strategy will be guided by a structured process, using a menu of core functions and forms with evidence-based barrier assessment and intervention options. The centralized implementation will be based on the prevalent KPSC regional approach to new practice implementation, involving the design of a multi-component approach that is delivered in a relatively consistent manner. Twelve of the 14 KPSC medical centers will be randomized to receive one of the two implementation approaches, with two medical centers serving as pilot sites. The study subject will include screening age women, primary care and obstetrics \& gynecology physicians, as well as clinic staff, administrators and operational leaders. The primary outcome of interest is uptake of primary HPV screening at the provider level. The secondary outcomes include stakeholder-centered outcomes such as knowledge and satisfaction, and additional implementation and system outcomes as well as implementation process evaluation. Data collection will be via electronic medical record extraction, patient and provider surveys, and semi-structured key-informant interviews. Multi-level models and generalized estimating equations will be used to evaluate the effect of the local-tailored approach on each outcomes of interest. Effect heterogeneity by multi-level factors will be examined by interaction terms. Content analysis will be used to evaluate qualitative data collected for Aims 1 and 3. We will use the Consolidated Framework for Implementation Research (CFIR) and the Theoretical Domains Framework (TDF) to inform our overall study approach and provide rigor and structure to our analyses.