Study of Key Success Factors for Lean Six Sigma And Last Planner System In Basement Work On High-rise Residential Building Projects, Jakarta Indonesia
Keywords:Lean Six Sigma, Last Planner System, Statistical analysis.
Currently, the construction of high-rise buildings is increasingly being carried out, in line with economic growth in big cities, but vacant land for settlements, offices and residential buildings is very little or limited, as well as the high price of land in cities. The level of housing needs in Indonesia. According to  estimates until 2025 are as shown below. Where in Indonesia until 2025 it is estimated that it will require housing around 1,513,865 residential units. so that the need for residential units in cities is very large, to cope with limited land and high prices of land in the city, now to meet the residential needs, buildings are made vertically (highrise), but with limited land and rampant construction of high-rise buildings have an effect on the need for parking lots, to overcome this, a basement was made, which could be used as a parking area in addition to other functions such as utility rooms and others. In the implementation of high-rise building construction projects, good scheduling and quality control play a very important role, in the timeliness, cost and quality / quality of project completion as a whole.  The success of a construction project is based on 3 things, namely cost, quality and time. To control cost, quality and time in this study using the Lean Six Sigma and Last Planner System methods. By using this method, it will control waste (waste) and control scheduling so that work delays do not occur. To get the factors that affect cost efficiency, quality and time, researchers use analysis with SPSS software (Statistical Package for the Social Sciens), with SPSS 10 key success factors that can streamline costs, quality and time are obtained as follows: 1. Reduction costs, 2. Improve communication among project participants, 3. Knowledge of the project, 4. Planning Process, 5. Predictable Work Plan, 6. Prepare a weekly plan, 7. BoQ, 8. Image, 9. Damaged Soil Removal Method, 10. Weather Conditions. These 10 factors are expected to make cost, quality and time efficiency in construction implementation.
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