Incorrect Requirements

Certain requirements, when analyzed, can be shown to be clearly incorrect. As an example, suppose a requirement for the operational availability of a system is stated as follows:

• The system shall have an operational availability of 0.995 with an MTBF (mean time between failures) of 500 hours and an MDT (mean down time) of 6 hours.

If we use the standard relationship for availability as

we obtain an availability calculated as 0.988, which is less than the specified value of 0.995. Thus, there is an error in the requirement as stated. This requires further discussion and clarification with the customer in order to resolve the problem. A failure to deal with what appear to be incorrect requirements places the systems engineering effort at risk. This may result in downstream schedule and cost overruns.

Project Management Made Easy

Project Management Made Easy

What you need to know about… Project Management Made Easy! Project management consists of more than just a large building project and can encompass small projects as well. No matter what the size of your project, you need to have some sort of project management. How you manage your project has everything to do with its outcome.

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