Design: two-dimensional representation by means of lines and
signs of a real or imagined.
Drawing: a tool that allows, through a
conventional set of lines, symbols and other designations, provide
of information about the function, the shape, the size,
on the workmanship and material related to a certain
object.
The main difference between drawing (e.g. artistic) and drawing
technician is that the former is a form of communication, the second
a tool for the transmission of information.

Classification of engineering drawings based on aggregation hierarchy

• Overall design (or Assembly drawing). Represents the collection of
  groups in the installation conditions up to define the complete machine. By
  usually does not report quote, if not the overall dimensions.
• Bill Group (or subassembly). Represents a comprehensive
  particular functional group. Can restore some functional dimensions
  must be subject to control.
• Bill subgroup. Similar to the group design, but at a level of
  lower hierarchy (more detail)
• Detail design (or production). Represents a single
  component. Contains all necessary indications for the manufacture and
  tab control (e.g. dimensions, tolerances, roughness, etc.).
• Detail drawing. Represents a component parts, normally
  Zoom information, geometrical and constructive.