EVT (engineering validation test)

EVT builds are small quantities made with the intended electronics and mechanics, though often with prototype-process parts (printed or machined housings, early boards). The goal is to show that the design works: every function, the performance specifications, power and thermal behavior, firmware fundamentals and early pre-compliance results.

EVT, DVT and PVT are widely used industry stage names rather than a formal standard, and companies adapt them. What matters is clear, written exit criteria for each stage.

Where it bites: skipping EVT exit criteria and rushing into tooling locks in design flaws. EVT exists to find problems, so budget time for at least one board or mechanical revision afterwards.