Usability includes methods of measuring usability, such as needs analysis and the study of the principles behind an object's perceived efficiency or elegance.
Crowne Burial Vault. The burial vault is a waterproof container designed for earth burial. Made in America and constructed of high technology polymer, it is strong enough to withstand the weight of earth-moving and cemetery maintenance equipment.
Barrel Vault. A vault is an arched brick or stone ceiling or roof of a building. A barrel vault is a type of vault with continuous arched surface, resembling the inside of a barrel or tunnel.