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Archive for the ‘Ask the Experts’ Category


When a system is modified, does its TRL change?

Posted on: August 30th, 2017 by Lou Wheatcraft No Comments

I was recently asked the question. “When a project begins with a existing device that has a TRL of 9 , with the goal to develop a miniaturized version of the device, is the TRL of miniaturized version of the … Read More

Implementation in Requirements – Internal Directive (i.e., Constraint) to use a Legacy Component.

Posted on: May 15th, 2017 by Lou Wheatcraft No Comments

We were recently asked the following question from one of our clients: “Our company is updating/replacing a legacy system.  The current system includes an embedded processor that was already built long ago and was developed without any requirements (at least … Read More

Levels of abstraction when writing requirements

Posted on: May 1st, 2017 by Lou Wheatcraft No Comments

Requirements Experts recently received an email from one of our clients seeking advice on levels of abstraction when stating requirements.  The email read as follows: “What are your thoughts on the use of “shall prevent” in a requirement. I believe … Read More

Use of active voice in requirements

Posted on: April 15th, 2017 by Lou Wheatcraft No Comments

Requirements Experts recently received an email from one of our clients seeking advice on the use of active voice when writing requirements.  The email read as follows: “In an academic paper I often use as reference, there are a number … Read More

What is the difference between verification and validation? Part 2

Posted on: January 15th, 2016 by Lou Wheatcraft No Comments

This is the second of our two-part blog concerning verification and validation.  In part 1 we discussed the basic concepts of verification and validation in terms of the context in which they are used within the system development lifecycle. In … Read More