This paper describes a model for use in predicting potential cost overruns on engineering design projects. The output of the model is useful in assessing the amount of possible risk on a project and the likelihood of making a profit on the job. The model is intended for use by engineering consultants, i.e., structural, mechanical, and electrical engineers, in the building design industry. This research uses fuzzy logic to model the relationships between the characteristics of a project and the potential risk events that may occur, and the associated cost overruns caused by combinations of the project characteristics and risk events. This paper discusses the topic of scope creep and scope definition, which are significant causes of cost overruns on design projects; identifies the project characteristics and risk events used in the model; explains the structure of the model and the use of fuzzy logic; and provides recommendations for future research.

Use of fuzzy logic for predicting design cost overruns on building projects

Purpose – This paper is aimed at identifying the common approaches for improving constructability and evaluating their effectiveness of implementation.Design/methodology/approach – A comprehensive survey has been carried out on contemporary literature, i.e. from 1990 onwards, to trace the development of the buildability and constructability concepts and the common approaches of improvement.Findings – Results show that buildability is mainly concerned with design, quality of built products, ease of construction, as well as efficient and economical construction. Constructability emphasises integration of construction knowledge and experience at various project stages; optimisation of different project requirements to achieve overall goals; and ease of construction. Therefore, “constructability” embraces the concept of “buildability”. The implementation of Quantified Assessment, Constructability Review and Constructability Programmes are the three commonly adopted approaches.Practical implications – Improvem...

A study of measures to improve constructability

This paper uses the quantitative decision-making technique, the analytical hierarchy process, to derive prioritized scales for (1) the constructability factors; and (2) the relative contribution of common construction systems in a building superstructure comprising structural frames, slabs, envelopes, roof, and internal walls toward constructability. The identified constructability factors show that to enhance constructability design requirements should be easily visualized and coordinated by site staff, while designs should allow economic use of contractors’ resources and enable contractors to develop and adopt alternative construction details. The precast method is rated as the most constructible construction method, indicating its better performance in facilitating efficient and safe construction in the busy urban environment in Hong Kong. However, the methodology adopted in this study should be of international interest, especially for those desirous of improving constructability of designs with diffe...

Constructability rankings of construction systems based on the analytical hierarchy process

The capability to represent design solutions with product models has increased significantly in recent years. Correspondingly the formalization of design methods has progressed for several traditional design disciplines, making the multi-disciplinary design process increasingly performance and computer-based. A similar formalization of construction concepts is needed so that construction professionals can participate as a discipline contributing to the model-based design of a facility and its development processes and organization. This paper presents research that aims at formalizing construction concepts to make them self-aware in the context of virtual computer models of facilities and their construction schedules and organizations. It also describes a research method that has been developed at the Center for Integrated Facility Engineering at Stanford University to address the challenge of carrying out scientifically sound research in a project-based industry like construction.

Formalizing construction knowledge for concurrent performance-based design

Successful performance measurement criteria cannot be limited to meeting just the three traditional criteria. Satisfaction is a subjective and critical measurement for the stakeholder performance, but it has rarely been used as a criterion for the performance measurement of project stakeholders. The purpose of this paper is to establish the client and customer satisfaction criteria as the two key stakeholders in construction project for the issue of performance measurement based on the reviewed data. The methodology of this study is based on comprehensive literature review of performance measurements for client and customer whereby the data were analyzed, using the metrics which are the aggregate number of each customer and client-satisfaction criteria occurring in previous study. From the metric analysis, the common factors for customer and client satisfaction were ranked. From the analysis, it can be concluded that expectation and perception are the two common critical satisfaction criteria for client and customer that must be considered where the satisfaction is required. DOI: 10.1061/(ASCE)ME.1943-5479.0000183. © 2014 American Society of Civil Engineers.

Critical Criteria on Client and Customer Satisfaction for the Issue of Performance Measurement

The timely execution of a construction project is very important to the owner, who makes commitments and plans based on the project's anticipated completion data. Failure of a design professional t...

Improving Constructability during Design Phase

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Improving Constructability during Design Phase