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.
This burial vault full of skeletons was found while work was being done on water pipes under Washington Square Park. City workers made a stunning discovery this week when they stumbled upon a 19th century burial vault â which then led to the finding of a second tomb â containing skeletal remains beneath the edge of Washington Square Park.