Dealing adequately with technical uncertainties

Statistics, RAMS & Quality Management
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How much does MTBF calculation cost?
  What does MTBF mean
  How do MTBF calculations work
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  Cost of MTBF calculations

The effort of a MTBF calculation depends strongly on the quality of the data provided by the customer.
Since most MTBF calculations are based on BOMs (bill of materials), the BOM quality is a significant factor.

Good BOMs meet the following criteria:
  1. All BOM items have a unique identifier
  2. All BOM items have a useful description
  3. The BOM must be available in an editable tabular format, eligible for import into dedicated reliability software.
The more comprehensive the BOM, the more important the criteria. For small BOMs (50 ... 100 BOM items) however, these criteria are less important.

Criterion 1 (unique identifier for each BOM item) is very efficient for returning customers:

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