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.
A burial liner is similar to a burial vault, but does not have a bottom. With a burial liner, the coffin is lowered directly onto the earth. The burial liner is then lowered over the casket. Modern burial liners may also be made of concrete, metal, or plastic.