In the world of construction services, labor productivity is one of the determining factors for the success of a development project. Every worker in all construction sectors must own high work productivity. The high and low work productivity of the workforce greatly affects the implementation time of the construction project. Efforts should made to increasing labor productivity by tightening supervision and paying attention to the composition of each working group so that they can work optimally. This study analyzes the productivity of workers in reinforced concrete structure work, which is devoted to ironwork and formwork installation, by calculating the productivity of various compositions of working groups, and comparing the productivity results of these working groups. The method used to compare working groups is the observation method (direct observation), evaluating behavior for a continuous period time, without intervening in the observed environment.

Keywords : Productivity; Labor; Construction Projects; Working Group.