SyntheSys Systems Engineering

OptimiSE Magazine

OptimiSE magazine, SyntheSys’ biannual publication is aimed at members of the Software and Systems Engineering Community.  The magazine aims to share best practices and technical insight and gives us a platform to share company news.  This informative magazine presents a collection of articles about Systems and Software and we hope that you, our colleagues and customers throughout the community, will find it both interesting and useful.

OptimiSE Magazine - Issue 1

Featured Issue: Issue 2 - January 2019

Functional and Non-Functional Requirements

Functional Requirements describe how a product must behave - they identify its functions.  Some people describe these as 'capability' requirements.  These are the ones that everyone has an opinion on and they are relatively easy to capture.


Non-Functional Requirements are sometimes described as 'anything about a system that isn't what it does'.  They describe the quality attributes of a system and they impose limitations on the functions of the system.


In this article we look at the difference between functional and non-functional requirements.  What's the difference between what the solution must do and how it must be done?

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More from OptimiSE Magazine

Guest Article: Model-Based Systems Engineering with OMG SysML™

Supporting Network Rail IT Upgrade

Model-Based Systems Engineering is a growing discipline within Systems Engineering that returns significant benefits over traditional document-based methods across the entire life cycle.


Guest author, Fraser Chadburn, discusses the merits of the techniques and how OMG SysML™ is a game changer.

SyntheSys completes an upgrade of IBM® DOORS® and Rational® Publishing Engine at Network Rail.


Network Rail has a long history of using DOORS® in major engineering projects and in its Information Management division.  SyntheSys was invited by IBM® to take on the contract.  Read the full story to learn more about how Network Rail is using DOORS® to accelerate major railroad projects.

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Version 1.0b dated 15 February 2019