In the construction industry, many individual trades have to work concurrently. This creates many potential difficulties on the construction site, primarily in relation to efficiency loss and construction period extension. To improve efficiency we have developed a new interior finishing method. Using this method, both interior finishing and building services parts and components are well combined. It is well known fact that the repetitive nature of construction produces a learning effect, which reduces both the overall working period and labor man-hour utilised. However there is little learning data available which specifically relates to interior works. Therefore, using our developed method, we conducted an observation study in order to collect learning data in an 11 story housing project. The analysis demonstrates that a typical learning effect was found in 11 recorded repetitions.
