The document discusses various tests used to measure the workability of concrete, including slump tests, compacting factor tests, and Vee-Bee tests. The slump test measures how much the concrete sinks in a standard cone after it is removed. The compacting factor test measures the ratio of partially compacted concrete weight to fully compacted concrete weight. The Vee-Bee test indirectly measures workability for concretes that cannot be tested by the slump test.