*This improvement initiative was under the supervision of TAMAM Steering Team.
TAMAM journey at the Lebanese International School (LIS) started in 2013-2014. The school team collected data from focus groups with teachers and coordinators in all levels, analyzed this data, and reached the school improvement need, which is improving the formative evaluation and the instructional supervision process. The school team members then set their goals, improvement and operational objectives, criteria and indicators of success, which mainly focused on developing coordinators as mentors and as academic references. Implementation of the plan was accompanied with regular monitoring stations to overcome the challenges faced. This report describes the final evaluation Phase of TAMAM improvement journey at LIS, which involves detailed elaboration of all its stages over four years. This paper ends with the results obtained which show major development of the coordinator as an academic reference and as a mentor\coach. Results also show the institutionalization and adoption of all documents prepared by the team about instructional supervision at LIS. Moreover, all academic departments are currently working in the same way and for building capacity of its members. TAMAM Pillars are disseminated in the school culture and professional norms and TAMAM reform model currently leads all LIS school-based reforms. From here, TAMAM program expanded at LIS for achieving sustainable school improvement and organizational development.