Working drawings are drawings used as a reference or guide in the manufacture of a product.

This most often refers to engineering and architecture, but working drawings are used in many different modes of construction. These drawings are composed according to industry standards so that all the information is easily and clearly understood, and standard conventions and units are used

There are two distinct types of working drawing: one is the detail drawing, which shows various views of an object and includes important information such as measurements and tolerances that the craftsperson or machine operator might need to know when manufacturing the object, or that people using the object might need to know.

The second is an assembly drawing, which shows how various components fit together during construction.