Chartered Property Casualty Underwriter (CPCU) is a professional designation in property-casualty insurance and risk management.
A prototype is an early sample, model, or release of a product built to test a concept or process or to act as a thing to be replicated or learned from.It is a term used in a variety of contexts, including semantics, design, electronics, and software programming. A User Experience Prototype captures enough aspects of the intended design that it can support user research. 2  A Visual Prototype captures the size and appearance, but not the functionality, of the intended design.
See Wikipedia on white-box testing. That is, unit-test refers to the level at which the test takes place in the structure of the system, whereas white-and black-box testing refer to whether, at any level, the test approach is based on the internal design or only on the external specification of the unit.