The time taken to complete a specified task is often used as a measure when comparing two systems. This may be a high-level task, such as finding a product on an online shopping site; or a low-level task, such as a pointing task modelled by Fitts' Law.
Also used in hcistats2e: Chap. 4: page 57; Chap. 7: page 86; Chap. 8: page 98; Chap. 13: page 154; Chap. 14: page 165
Used in glossary entries: Fitts' Law, pointing task