Prakasit Naksomvongkul creator Ogunlana, Stephen O. Chairperson Chotchai Charoenngam Examination Committee Guey, Lin Der Examination committee Partial Asian Institute of Technology Scholarship donor text series technical report th Bangkok Asian Institute of Technology 1999 continuing eng 79 leaves : ill. ACCEST (ACCuracy in ESTimating) is a program used to analyze accuracy of design cost estimates by using contractors' bids as criteria for assessment. The program was developed by Ogunlana (1989) and was used for road projects in the United Kingdom. ACCEST95, the second version of ACCEST, was developed by Yeo (1995) for the purpose of analysing design cost estimates in civil and building projects in Thailand and Singapore. WinACCEST, the third version, was developed by Phongsupatsamit (1997) to use in Windows3. l l environment with the aim to enhance the user-friendliness of the previous programs. However, Windows3. l 1 is fading out and WinACCEST has some deficiencies in its usage, data recording and retrieving and so on. Therefore, a Windows95 version of the program named WinACCEST99 was created with Visual Basics and Help Workshop by using the same concept as in ACCEST. New features such as detailed elements analysis, learning facility, the new system to record and retrieve data were incorporated into the program. Estimating data from three projects were employed to evaluate the calculation, the steps involved in using, the system to record and retrieve data of the program. From the results, the calculations produced by WinACCEST99 and WinACCEST were exactly the same. It means that WinACCEST99 and WinACCEST are based on identical concepts for calculating the accuracy of design cost estimates. A thesis submitted in partial fulfillment of the requirement for the degree of Master of Engineering, School of Civil Engineering Thesis (M.Eng.) - Asian Institute of Technology, 1999 Windows (Computer programs) Asian Institute of Technology. http://203.159.5.9/ait-thesis/detail.php?q=B13152 http://203.159.5.9/ait-thesis/detail.php?q=B13152 211099 20260818090149.0