Sequential versus Fast Track Construction.

In sequential construction (Figure 1.10), each major phase in the design and construction of a building is completed before the next phase begins.

Sequential construction can take place under any of the project delivery methods described previously. It
is frequently associated with design/bid/build construction, where the separation of design and construction
phases fi ts naturally with the contractual separation between design and construction service providers.

Phased construction, also called fast track construction, aims to reduce the time required to complete a project by overlapping the design and construction of various project parts (Figure 1.10). By allowing construction to start sooner and by overlapping the work of design and construction, phased construction can reduce the time required to complete a project.

In sequential construction, construction does not begin until design is complete. In phased construction, design and construction activities overlap, with the goal of reducing the overall time required to complete a project.
Figure 1.10 In sequential construction, construction does not begin until design is complete.
In phased construction, design and construction activities overlap, with the goal of
reducing the overall time required to complete a project.


However, phased construction also introduces its own risks. Since construction on some parts of the project
begins before all design is complete, an overall cost for the project cannot be established until a signifi  cant portion of construction is underway.

Phased construction also introduces more complexity into the design process and increases the potential for costly design errors (for example, if foundation design does not ad-equately anticipate the requirements
of the not yet fully engineered structure above). Phased construction can be applied to any construction
delivery method discussed above. It is frequently associated with design/build and construction management project delivery methods, where the early participation of the construction entity provides resources that are
helpful in managing the complex coordination of overlapping design and construction activities.

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