Every interaction with the computer - from performing a search for information in a database that may last a few seconds to installing an operating system that can last for hours - requires users to expend time. How an interaction is designed to expend a user's time is a vital factor in the usability and overall perception of a product or service. A poorly-designed solution can, simply put, waste the user's time regardless of its brilliant architecture. A well-designed user solution, on the other hand, can win user satisfaction despite annoying delays.