Public perception is an important factor in deciding how long a test should be. Cost and complexity are other deciding factors. To explore best practices in certification, we looked at specifications for every test accredited by ANSI under ISO/IEC 17024.
How often should we write new test items?
To associate a timetable with the test-maintenance cycle, a test sponsor needs to answer two larger questions: How fast does the knowledge associated with the credential evolve? And how long can an item be in use before you consider it overexposed?
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