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.
Although most vaults today are designed to eliminate the intrusion of exterior elements, water may enter a vault is due to some type of foreign material, such as soil, on the sealing tongue on the base of the vault or in the groove located in the cover of the vault.