5. It is sometimes claimed that increasing quality and
reliability beyond levelsthat have been...

Question

5. It is sometimes claimed that increasing quality and
reliability beyond levelsthat have been achieved in the past is likely to be
uneconomic, due to the costs of the actions that would be necessary. Present
the argument against this belief. Illustrate it with an example from your own
experience.

7. Explain the difference between reliability and durability
and how they can be specified in a product development programme.

8. a. List the potential economic outcomes of poor reliability, and
identifywhich cost are directly quantifiable and which intangible. Explain how
they can be minimized, and discuss the extent to which very high reliability
(approaching zero failures) is achievable in practice.
b. What are themajor factors that might limit the achievement of
very high reliability?

9. After processing the existing program cost data and
running a regression model on the previous projects, the cost of product
development and manufacturing (CDM) has been estimated to follow the equation:
CDM=$0.8 million + $3.83 million (R is the achieved product reliability at
service life and is expected to be above 90%). The cost of failure (CF) has
been estimated as the sum of fixed cost of $40000 plus variable cost of $150
per failure. The total number of the expected failures is ,
where is the total number of produced units. Considering
that the production volume is expected to be 50000 units, estimate the optimal
target reliability and the total cost of the programme.

David · Accepted Answer

Reliability 
Practical reliability engineering 
5. It is sometimes claimed, that increasing quality and reliability beyond levels that have 
been achieved in the past is likely to be uneconomic due to the costs of the actions that would be 
necessary. I do not agree to this point. I had an experience of using Wikipedia, where in the 
numbers and equations were not very accurate. In case of Wikipedia, the reason for not 
providing highly reliable information is the economic constraints. This led to me having to 
commit an experiment three times and that was a lot more expensive.  
In instances like medicine, inaccuracies can be fatal. So it is important that quality and 
reliability be to the highest possible points, no matter what it costs. In case of there being an 
economic constraint, it is possible that it be mentioned in a footnote or in a bracket that the 
accuracy of the information is unverified. In this way misleading information can be identified.

5. It is sometimes claimed that increasing quality and reliability beyond levelsthat have been achieved in the past is likely to be uneconomic, due to the costs of the actions that would be necessary....

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