الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
 |  | from | 255 |  |  |
| | | from | 255 | | |
Abstract
Proper cost and schedule control is the key to the completion of a construction project within budget, on time, and with few problems. This paper presents a practical model for controlling construction projects. The model objectives are to calculate and present detailed cost, schedule, and time variances. Also, it presents the effect of changing quantities of worked performed in arising these variances. Effective monitoring of the progress of a construction projects requires the integration of cost and schedule control that share common work breakdown structures. Information is collected in the field and tracked against planned values to detect deviations in actual performance. The entry, processing, and flow of information are important in avoiding problems on applying this model. To circumvent some of the expected complexities in modeling, a spreadsheetbased model is developed to be transparent and easily usable by practitioners. To automate the model a macro programming using VBA is used. The proposed system had been applied to a reallife project where it proved to be adequate and effective. The model presented in this study is easytouse, transparent, and can be used in large size projects. These characteristics make it attractive to practitioners to improve controlling construction projects. The primary objective during the construction of a project is completing the project on time within budget while meeting established quality requirements and other specifications. This, in turn, mandates special attention be paid to the project cost, schedule and time control considering the specific nature of the project. Because of many unexpected factors, most construction projects are liable to be behind schedule and over budget. As a result, there has been a need for a control system to handle both functions: cost, and time management. Managing both time and cost could ensure finishing the project on time and within budget. To do so, however, requires a substantial focus on controlling the construction process where the proper cost and schedule plays the key role. In the construction industry, contractors usually use their experience to estimate costs and durations for a project. Typically, a project is broken down into activities with identified resources. Actually costs and durations may be changed from that estimated. Control is calculating variances between actual measured cost and progress on one hand and targets and schedules on the other to determine if activities are being performed as intended. To do so, however, requires a substantial focus on cost and schedule control systems that calculate cost, schedule and time variances at different level of details. Proposed model will make these contributions to the literature and software design: (1) It presents a more detailed cost variances and how material, labours, equipments, subcontractors, and overheads can contribute with cost variances; (2) it presents schedule and time variance structures that parallel cost variance structure; (3) it describes how change of quantities can affecting on cost, schedule, and time variances; and (4) it presented projected cost and time variances.