Efficiency evaluation based on HEAT (Health economic Assessment Tool, www.euro.who.int/HEAT) and costs-to-effectiveness ratios are calculated in the end of the study for the combination of both phases as well as for the comparison of the phases. Environmental mediators and moderators related to active commuting to work are examined objectively at all evaluation points with GIS-analysis by connecting in-formation on physical environment to the routes, which employees are using for commuting to work. The information on estimated routes is obtained from the questionnaires (home and workplace addresses) and the information on actual routes from GPS, which a subgroup of employees will provide by using free-of-charge application (e.g. SportsTracker) in their smartphones.