Leader-based workplace health interventions in small-scale enterprises: a pre post Study. Introduction Leader’s competence about health and working environment issues is of particular importance in small scale enterprises (SSEs). Studies indicate lack of tools for 44 Book of abstracts – FALF 2016implementation of working environment improvements and support from occupationalhealth services to develop such services towards SSE`s. The aim of the study was to investigate organizational-, psychosocial working environment- and health outcomes among leaders and employees in SSEs before and after workplace health interventions, and to contribute to knowledge about tools suited for implementation. Description Data presented is part of a research project concerning leader-based workplace health interventions in SSEs. 179 subjects, intervention group (103) and control group (76), from 32 SSE ́s in the middle part of Norway and Sweden participated. Leaders (N=30) and Employees (N=149) answered validated questionnaires (WEMS, SHIS and N-POP) covering organizational outcomes, psychosocial working conditions and health. The interventions were carried out by advisers from occupational health services, and consisted of courses, meetings including information, advices and tools for working on issues like leadership, working environment, and health during a one year period. Results Organizational outcomes as Job Performance indicatedan interaction in favor of intervention group compared to control group, and for leaders compared to employees. For Psychosocial working conditions, the Swedish leaders reported a positive change concerning pressure of Time. Regarding Health outcomes the Norwegian leaders reported a more positive development concerning sleep problems compared to employees in Norway, and leaders in Sweden. The Intervention group reported lower Sickness absence. Conclusion Leader-based interventions in SSE`s seems effectively to a limited extent. Time between pre and post intervention including measure points, might be too short to detect improvements over time.