The CRAFT-OA project aims to consolidate the Diamond Open Access (OA) publishing landscape through various activities, including the improvement of the technical and organisational infrastructure of Diamond OA. One of the project's tasks is to analyse technical challenges faced by Institutional Publishing Service Providers (IPSPs) and Institutional Publishing Tools and Technology Providers (IPTPs). Complementarily, the Developing Institutional Open Access Publishing Models to Advance Scholarly Communication (DIAMAS) project focuses on mapping the landscape of institutional publishing in Europe1 to elevate academic publishing standards. The project also addresses several technical aspects, and provides valuable information for this analysis. The CRAFT-OA project aims to consolidate the Diamond Open Access (OA) publishing landscape through various activities, including the improvement of the technical and organisational infrastructure of Diamond OA. One of the project's tasks is to analyse technical challenges faced by Institutional Publishing Service Providers (IPSPs) and Institutional Publishing Tools and Technology Providers (IPTPs). Complementarily, the Developing Institutional Open Access Publishing Models to Advance Scholarly Communication (DIAMAS) project focuses on mapping the landscape of institutional publishing in Europe1 to elevate academic publishing standards. The project also addresses several technical aspects, and provides valuable information for this analysis. The technical gap analysis within CRAFT-OA D2.3 reveals gaps ranging from insufficient application of technical standards to challenges related to publishing software, and proposes solutions to them. After pinpointing the most significant gaps of IPSPs and IPTPs, the deliverable introduces measures and describes activities in CRAFT-OA and DIAMAS to mitigate them. Among others, the CRAFT-OA project will implement technical enhancements to OJS. The project will provide extensive information such as training materials based on the upskilling curriculum, recommendations, toolkits, and more. Several solutions are classified as Key Exploitable Results (KERs) and will be sustained after the end of the CRAFT-OA project. DIAMAS will provide a tool suite, guidelines, and training material.This deliverable presents ways of overcoming the challenges across the diverse institutional publishing community, mainly represented by IPSPs and IPTPs, with a special focus on Diamond OA publishing. This document offers a high-level community transition plan that will enable propagating suggested solutions for closing the technical gaps and maintaining a high level of technical proficiency within the Diamond OA publishing community. The suggested high-level community transition plan consists of three phases: analysis, transition and stabilisation, while the activities and outputs of CRAFT-OA and DIAMAS (tasks, milestones, deliverables, and other outputs) are mapped to the phases. This deliverable is currently under review by the EC.