The Common Action Plan on Clustering Activities is written in the framework of WP9 Project Management and Coordination (Task 9.4 Clustering and Interactions with Other Projects) of the IN-HABIT Project under Grant Agreement No. 869227. The aim of the Common Action Plan on Clustering Activities is to build on the established contacts with other project coordinators for further collaboration, especially with those projects funded under the “Smart and Sustainable Cities” call, as well as with sister projects funded under the same topic SC5-14-2019 “Visionary and integrated solutions to improve well-being and health incities”. After several meetings with sister projects (VARCITIES, GOGREENROUTES and euPOLIS) a series of joint actions are delineated in this deliverable, based on the agreed cross-cutting issues and result sharing among the 4 projects, such as creating common baseline and indicators for wellbeing and health, address the gender, diversity, equity, and inclusion (GDE&I) perspective, as well as develop joint communication and dissemination activities. The Common Action Plan on Clustering Activities is a living document, and regular updates of this deliverable will be promoted, when new joint activities are agreed with sister projects and other projects dealing with issues addressed by IN-HABIT. This information will be updated on the periodical meetings hosted with the representatives of the sister projects. IN-HABIT Steering Committee and General Assembly will be informed on the decisions taken and the participation of the partners involved requested. Each time the document is updated all partners will be duly informed about it.