How to integrate productivity in life-cycle cost analysis of building services. This REHVA guidebook shows for the first time how to quantify the effects of indoor environment on office work, and also how to include these effects in the calculation of building costs. This is a concerted effort of researchers, engineers and ractitioners. Such calculations have not been performed previously, as very little data was available on this issue. In recent years more and more information has become available on this topic.