TABLE I

Rating Guideline for Severity, Occurrence, and Detectability

Rating Scales for Conducting a Biopharmaceutical Process FMEA
RatingSeverity of Failure EffectOccurrence of Failure ModeDetectability of Failure Mode or Cause
10No approval of batch
  • otherwise likelihood to lose license or to compromise patient safety or

  • because out of product specifications

Error in ≥50%
  • of batches or

  • of step duration

  • Incapable of measurement and

  • No checks and

  • No indication of error and

  • Not detectable coincidentally

9Approval of batch is in jeopardy
  • because license or patient safety is in jeopardy or

  • because of risk of not meeting specs

Error in ≥20%
  • of batches or

  • of step duration

  • Detectable coincidentally only or

  • Error indications recognized <50% of cases

8
  • Potential severe effect on product quality/efficacy or safety or

  • Loss of complete batch without any rework options

Error in ≥10%
  • of batches or

  • of step duration

  • Occasional manual checks only or

  • Detectable only indirectly (indications without direct correlation)

7
  • Potential moderate effect on product quality/efficacy or safety or

  • Significant loss of overall yield (≥50%)

Error in ≥5%
  • of batches or

  • of step duration

  • Parameter is manually checked routinely by onsite operator and

  • No automated system, no automated alarm

6
  • Potential minor effect on product quality/efficacy or safety or

  • Moderate loss of overall yield (≥20%)

Error in ≥2%
  • of batches or

  • of step duration

  • Parameter is manually double checked in batch record and

  • Failure is detectable only after affected process step is completed

5
  • No influence on product quality/efficacy or safety expected and

  • Minor loss of overall yield (<20%)

Error in ≥1%
  • of batches or

  • of step duration

  • Parameter is manually double checked in batch record and

  • Failure is detectable before affected process step is completed

4
  • No influence on product quality/efficacy or safety expected and

  • Negligible loss of yield

Error in ≥0.5%
  • of batches or

  • of step duration

  • Parameter is monitored by a single alarm controlled system or

  • Manual input parameter is automatically checked

3
  • Definitely no impact on product quality/efficacy or safety and

  • Negligible loss of yield

Error in ≥0.2%
  • of batches or

  • of step duration

  • Two or more redundant parameters checked by any combination of automated and/or manual controls (input and/or output parameters)

2
  • Definitely no impact on product quality/efficacy or safety and

  • No yield loss but other consequences

Error in <0.2%
  • of batches or

  • of step duration

  • Parameter is monitored by two or more redundant systems and

  • Two or more of these systems are alarm controlled

1
  • Definitely no impact on product quality/efficacy or safety and

  • Only negligible consequences

  • Never occurred and

  • Implausible (but not impossible)

  • Failure is always immediately obvious to onsite operator