According to DIN 199, a technical drawing is a drawing of the type and completeness required for technical purposes, e.g. by adhering to representation rules and dimensional entries. This means that a technical drawing provides all the information that further entities need to complete a project, while adhering to certain conventions that simplify this exchange of information. For example, standards are adhered to in the representation and labeling of the material depicted to facilitate understanding. Product and manufacturing specifications, such as the form and position tolerances or the tolerance principle, are recorded in technical drawings.