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Design changes that happen early in the design process are less expensive when compared to those that take place after it is introduced into full-scale production. The cost of the change increases with its development time. [3] Fundamentally, design changes can be classified into pre production and post production changes.
The basis for reliability is not to change a design; therefore, Mr. Yoshimura believes that if a design changes, the change should occur in small increments. Disturbance to a design is caused by the discontinuity of implementing changes affecting the interfaces between parts and interactions between systems.
The design process is plan-driven. The design process is understood in terms of a discrete sequence of stages. The rational model is based on a rationalist philosophy [12] and underlies the waterfall model, [19] systems development life cycle, [20] and much of the engineering design literature. [21]
Notes concerning changes or differences from the original documents should be made on the shop drawing for the architect’s and engineer’s approval. Ultimately, they are responsible for changes in these drawings and should have the opportunity to analyze any modifications.
In chip design, ECO is the process of inserting a logic change directly into the netlist after it has already been processed by an automatic tool. Before the chip masks are made, ECOs are usually done to save time, by avoiding the need for full ASIC logic synthesis, technology mapping, place, route, layout extraction, and timing verification ...
In traditional construction contracts (known as design–bid–build contracts) the principal contractor is only engaged when a detailed design is complete. An invitation to tender is published and a number of contractors will price the construction of the design, from which a single winner will be chosen to complete the works. Contractors are ...
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With the traditional design–bid–build process, a complete set of construction documents and specifications describes what the builder agrees to build and serves as the heart of the contract. On Fast-track projects, the design, construction documents and specifications are incomplete, so setting the final cost presents problems.