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Research problem and specific questions.There is a need to improve suicide prevention strategies in Sweden. To address this, the proposed project will evaluate Uppföljningssamtal, a novel intervention that consists of supportive telephone calls delivered over 12-months with the goal to reduce suicidality in individuals with increased suicide risk. Two studies are planned:   Pilot Study 1, will evaluate practicality and perceived helpfulness of Uppföljningssamtal through examining the following research questions:  1a: What are end-users’ feedback on Uppföjlningssamtal? 1b: How do staff who deliver Uppföljningssamtal view acceptability, and practical implementation needs? Guided by these results, Study 2 will evaluate effectiveness (if the intervention works), treatment mechanisms (why the intervention works) for end-users and further implementation needs through the following research questions:  2a: Does Uppföljningssamtal lead to significant reductions in end-users’ suicidal ideation? 2b: Does Uppföljningssamtal lead to reduced hospital admissions for suicide attempts? 2c: What are the effective components of the Uppföljningssamtal intervention?  2d: What are staffs’ feedback regarding barriers and facilitators to implementing Uppföljningssamtal beyond the current project? Data and method.Study 1 will use a mixed-methods design, combining quantitative questionnaires with qualitative interviews, to ensure comprehensive data is gathered from staff and end-users. Study 2 will be a randomized controlled trial, where participants will be randomly allocated to Uppföljningssamtal or a control condition, as this is the ‘gold-standard’ method for evaluating intervention effectiveness. Societal relevance and utilization.This project will add crucial insights into the implementation of a novel suicide prevention strategy in Sweden. This does not only benefit individuals in need of support, but also wider society, by advancing our understanding of effective suicide prevention strategies

knowledge that can be utilized and built on, beyond the current project. Plan for project realisation.A 3-year project is planned. At the project start, Study 1 will already be ongoing, and will be finalised in 2025, whilst Study 2 is prepared. In 2026, Study 2 will start, and remain ongoing until Sep 2027, after which results will be finalised to ensure timely project conclusion. Costs will cover the main applicant, a research assistant and intervention staff.