Limitations of the Prediction Process
The main limitations of the practical prediction process stem from possible inaccuracies in reliability models, particularly with regard to the following assumptions:
• Constant failure rate during the useful life of an item.
• Independence of items within a system, thereby permitting use of the product rule for combining probabilities.
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The implications of these factors are discussed in the following paragraphs. Other limitations include the lack of appropriate failure rate data, particularly in respect to advanced technology items and mechanical items, and difficulties of accurately modelling the true operating conditions.
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