Dimensioning should include

• units of measurement
• dimension lines, extension lines, arrowheads, and leaders
• placement of dimensions (e.g., unidirectional, aligned)
• application of standards for applying dimensions to various geometric shapes.

Note: ANSI Standard Y14.5

Process/Skill Questions:

• What are the types of dimensioning systems?
• Why should placement of dimensions follow a standard pattern?
• What are some consequences of improper dimensioning?