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.
Why are burial vaults and grave liners necessary? Cemeteries often require a burial vault or a grave liner to enclose the casket in a grave. The vault or liner is used to prevent the ground from caving in as the casket deteriorates. Burial vaults are considerably more expensive than liners. You may choose to prearrange a funeral instead of waiting until a later date.