noun
testing stage; test phase
Refers to a phase in development or evaluation where something is being tested, such as a product, system, or process.
新製品はまだ試験段階です。
The new product is still in the testing stage.
試験段階で多くの問題が見つかった。
Many problems were found during the test phase.
Similar meaning, but 試験段階 is slightly more formal and often used in technical or engineering contexts.
Compound of 試験 (test, examination) and 段階 (stage, phase).