DPLI Screening study materials
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DPLI Screening: Inspection and Testing Procedures

DPLI Screening · Work through your exam, one topic at a time.

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Inspection and Testing Procedures

The Inspection and Testing Procedures domain tests whether you can execute a defined inspection or test the same way twice, from pre-checks to the acceptance decision, and handle anomalies without biasing the result. The exam rewards sequence, evidence, and stopping rules.

Standard flow

  • Confirm the current procedure version, equipment status, and your own competence before starting.
  • Pre-use checks: cleanliness, power, self-test, reference standard validity, and environmental conditions within specification.
  • Perform steps in the prescribed order and keep the item or subject identified throughout.
  • Compare results with the stated acceptance criteria. Criteria are decided before the test, not after seeing data.

Checks, repeats, and nonconformance

A verification check uses a known reference or calibrated standard and records the result. Repeat a test only under the procedure's repeat rules; testing until a pass appears is data manipulation. If a result is outside criteria, stop, flag or quarantine the item, escalate, and do not release it on verbal assurance.

Worked example

During a routine check, a known reference gives a borderline result. Borderline is not a pass. First confirm the reference is in date and the environment is within limits, then repeat once as the procedure allows. If the result remains outside criteria, stop the activity, quarantine the equipment or item, and record the raw values. Do not adjust the acceptance limit or discard the first result.

Traps

  • Cherry-picking the best of several runs.
  • Skipping pre-checks because the last shift passed.
  • Using an expired reference standard.
  • Signing a step someone else performed.
  • Changing settings mid-test without recording it.