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.
The cloth is sometimes perfumed, but as in natural burial, no chemical preservatives or embalming fluid are used, nor is there a burial vault, coffin or casket. Coffins are used, however, in countries such as the UK, where the law requires it.