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A shop drawing is a specialized drawing that is prepared by contractors, subcontractors, or suppliers. It provides detailed information about specific components, materials, and systems that will be fabricated or installed in a construction project. These drawings are essential for ensuring that the custom elements conform to the design intent set forth in the construction documents.

The purpose of shop drawings is to illustrate how components are to be constructed or installed. They may include dimensions, manufacturing specifications, and other critical details to ensure accuracy and compatibility with other elements of the project. This type of drawing often needs to be approved by the architect or engineer to verify compliance with design intent before work commences.

In contrast, a detailed cost analysis focuses on budgeting and financial aspects, a plan for site management addresses logistical coordination on site, and a general layout gives an overview but lacks the specificity required for individual component production. Hence, the definition of a shop drawing fits perfectly with the option of it being a drawing produced by contractors or suppliers.