Sriprasert E, Dawood N
Requirements identification for 4D constraintbased construction planning and control system
Abstract: Construction planning and control are identified among the top potential areas
needing improvements. A traditional technique known as the Critical Path Method
(CPM) has been widely criticised in terms of its inability to cope with nonprecedence
constraints, difficulty to evaluate and communicate interdependencies,
and inadequacy for work-face productions. Attempting to treat these deficiencies,
substantial research efforts have resulted in a wide range of advancements
including design of new planning and control methodologies and development of
sophisticated computerised applications. However, these efforts have not effectively
overcome all of the above CPM drawbacks and, therefore, have not yet provided a
solution to the industry.
This paper identifies requirements for the next generation of the planning and
control as multi-constraints, visual, and lean-based system. In order to achieve this
goal, important construction constraints and their characteristics are derived from
previous literature. Various constraint detection and satisfaction techniques such
as knowledge-based system, advanced computational algorithm, and 4D
visualisation are also investigated. As a part of the Lean Enterprise Web-based
Information System (LEWIS) presented in the companion paper, a developing
prototype called 4D constraint-based planning and control system is briefly
demonstrated. It is anticipated that successful implementation of this system will
enable generation of reliable plans and constraint-free assignments, which will, in
turn, reduce production risks and improve on-site productivity.
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Permission to reproduce these documents have been graciously provided by the Aarhus School of Architecture, Denmark. The assistnace of the editor, Prof. Kristian Agger, is gratefully aprecciated.