We have been taught designing process throughout the long period of education. Nevertheless it is hard to make a quick response to actual project However if we are faced with the actual project as a design professionals it is hard to cope with the project at once nothing but ambiguous idea. Also most of designers concemed with the project do not recognize who are responsible for what. Consequently this attitude delays the entire operation causing waste of time and resources and leads to the unacceptable result. This research is designed therefore to come up with the projects control process that is practical enough to encourage interior designers as well as design firms to face actual projects with shrewd response. There is of course no single right answer to certain design projects. But at least there should be a guideline which shows designers more reasonale systematic ways to control design project lest they should waste time and cost : a guideline as an assistance for successful design result.