Lectures and labs investigate the deformation and fracture behaviour of rocks when subjected to natural and engineering-imposed stress fields. The concepts of stress, strain, stress-strain relations, and strength are applied to geological materials in laboratory and field settings. The mechanisms involved in the failure of continuous, discontinuous, ductile, and brittle rocks are discussed. Consideration of these subjects is given in the context of various rock engineering applications, including slopes and underground excavations such as mines, tunnels, and caverns.