Identification should include the

physical description of each
function of each
location of each once they are installed
rafter layout specifications
rafter length measurements
pitch and birdsmouth
building code reference for the installation requirements of rafters.

Process/Skill Questions:

What are the differences among common, valley, hip, and jack/cripple rafters? When should each be used?
Which set of plans should be read and followed when laying out rafters?
What determines the spacing and size of rafters?
What are the various methods for installing rafters?
What are the advantages and disadvantages of each installation method?

NCCER Carpentry
Level One, Module 27112 Roof Framing describes the most common roof types and introduces basic roof framing components. Includes instructions for laying out rafters for gable roofs, hip roofs, and valley intersections. Covers stick-built and truss-built roofs, and includes the basics of roof sheathing installation.