Systems Engineering Articles

Systems engineering articles from Reqi: requirements management, MBSE, safety assurance, RAMS and AI in engineering, explained for practitioners.

Stakeholder Needs into requirements
Requirements

Transforming Stakeholder Needs into Requirements: Best Practices

The 7-column worksheet for turning what stakeholders actually say into testable requirements — with five real statements worked through end to end.

What Safety Integrity Level (SIL) Means and How to Calculate It
Safety and Hazards

What Safety Integrity Level (SIL) Means and How to Calculate It

A worked SIL calculation example: LOPA-style SIL target for a tank overfill, the 1oo1 PFDavg formula with real arithmetic, and SIL 1-4 PFH ranges.

what is it Model-Based Systems Engineering (MBSE)?
Terms

What is Model-Based Systems Engineering (MBSE)?

MBSE tools and software compared side by side: Cameo, Capella, Sparx EA, Rhapsody and SysML v2, plus OOSEM, Arcadia and MagicGrid, and how to choose.

Systems Architecture
Terms

What is Systems Architecture?

Systems architecture is the structure of a system — its components and how they fit. Why it matters and a step-by-step guide to defining one.

Hazard Logs
Terms

What is a Hazard Log?

A hazard log is a living record of a system's hazards, the controls applied and the evidence risk is managed. What it contains and why it matters.

MBSE SysML Notation
Model Based System Engineering (MBSE)

Implementing MBSE (Model-Based Systems Engineering) in Your Organization

How to implement MBSE in a real organisation — the tools, training, processes and culture change needed to make model-based systems engineering stick.

Shall vs. Should vs. Will vs. Must: What’s the Difference and Why Does It Matter?
Requirements

Shall vs Should vs Will vs Must: What’s the Difference and Why Does It Matter?

What each modal verb binds you to, plus the requirements language rule card and eight bad requirements rewritten into testable ones.

The perfect system is unknowable
AI and Machine learning

The Future of Projects: AI Leadership in the Age of Digital Transformation

The role of leadership in harnessing AI across planning and engineering — what changes, the skills that matter, and how to lead through the transition.

DOORS NG Image
Requirements

Introduction to DOORS for Beginners

A beginner tutorial for IBM DOORS and DOORS Next: a decoder for the eight terms that confuse everyone, plus a ten-step first-project walkthrough.

System Engineering V Diagram: The Power of the Vee
Systems Engineering

System Engineering V Diagram: The Power of the Vee

A stage-by-stage walkthrough of the systems engineering V (Vee) diagram: decomposition down the left arm, integration and verification up the right.

User Requirements & System Specifications
Requirements

Requirement vs. Specification: What is the difference?

A requirement states what a system must do; a specification states how. The key differences, which comes first, and how they link via traceability.

Model-Based Systems Engineering Book Reading
Model Based System Engineering (MBSE)

Unlocking MBSE: Choosing the Best Books for Model-Based Systems Engineering

The best books to learn model-based systems engineering and SysML — from gentle introductions to deep references, and who each one is for.