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 vault is a lined and sealed outer receptacle that houses the casket. It protects the casket from the weight of the earth and heavy maintenance equipment that will pass over the grave. It also helps resist water and preserves the beauty of the cemetery or memorial park by preventing the ground from settling.