Incident, Deviation,OOS,OOT describes

Detailed Breakdown

​1. Deviation

• ​Definition: Any departure from a written procedure, standard, or instruction.
• ​Types:
  • ​Planned Deviation: A temporary, pre-approved change. (e.g., “We are out of Filter A, so we have permission to use Filter B for this batch only.”)
  • ​Unplanned Deviation: An accidental error. (e.g., “The operator set the machine speed to 50 RPM instead of the required 60 RPM.”)
• ​Key Trigger: The standard was not followed.

​2. Incident

• ​Definition: An unplanned event or breakdown that may not initially classify as a deviation but affects the environment or operations.
• ​Nuance: Some companies treat “Incident” as a “soft deviation” or a minor operational failure.
• ​Examples:
  • ​A water pipe leaks in the corridor (not directly on the product).
  • ​Software crashes during data entry.
• ​Key Trigger: An unexpected event occurred. (If the event affects the product, it often escalates into a Deviation).

​3. OOS (Out of Specification)

• ​Definition: A laboratory test result that falls outside the pre-established acceptance criteria (specifications).
• ​Scenario:
  • ​Specification: Tablet hardness must be between 5 kg and 10 kg.
  • ​Result: The tablet hardness is 4 kg.
• ​Key Trigger: The result failed the official limit. This requires a mandatory, rigorous investigation (Phase I & Phase II) to see if it was a lab error or a manufacturing failure.

​4. OOT (Out of Trend)

• ​Definition: A test result that is within the specification limits but generally disagrees with historical data or expected trends.
• ​Scenario:
  • ​Specification: Assay (Purity) must be 95% – 105%.
  • ​Historical Trend: The last 50 batches have all been between 99% and 100%.
  • ​Result: The new batch is 96%.
• ​Why it matters: Even though 96% is a “passing” score (it is inside the 95-105 limit), it is statistically unusual. It suggests the process is drifting and might fail (OOS) soon if not fixed.
• ​Key Trigger: The result is unusual compared to the past.

​Summary of the Relationship

​You can visualize the flow of these problems as follows:

1. ​Incident: The AC breaks down in the warehouse (Event).
2. ​Deviation: Because the AC broke, the temperature exceeded the SOP limit of 25°C for 2 hours (Process Violation).
3. ​OOT: You test the product stored there. The result is valid, but lower than usual stability (Warning).
4. ​OOS: You ignore the warning. Two months later, the product fails the test completely (Failure).

​Would you like me to explain the specific “Phase I vs. Phase II” investigation steps required when you get an OOS result?