Cairn Blog
Ideas on systems engineering, AI-assisted design, and the craft of building things that work.
The Convergent Pattern
When independent vendors arrive at the same workflow shape, that is the architecture announcing itself. The question is no longer whether AI belongs in MBSE — it is whether the tool was built around the pattern or had it bolted on after.
The SysML v2 Window
A federated repository, a RESTful API, a single source of truth. The new standard solves the problems engineers had ten years ago. The problem they have today is somewhere else entirely.
Trade Studies Deserve Better Than a Spreadsheet
The Pugh matrix was published in 1981. Forty-five years later, the state of the art for running one is still a spreadsheet that dies the moment someone closes the file.
Every Hard Problem Left Is a Systems Problem
AI is compressing the digital layer into a commodity. The engineers who hold complex physical systems in their heads are about to become the most important people in the room.
The Missing Middle of Engineering AI
Enterprise platforms add AI assistants to the tools they already sell. Student tools solve homework. In between — where practicing engineers actually work — there is almost nothing.
Why AI Can't Do Your Engineering Math (Yet)
LLMs reverse-engineer solutions from pattern-matching. They drop units, hallucinate material properties, and present wrong answers with perfect confidence. Engineers are right to be skeptical — and that skepticism is the design constraint.
Four Questions Your Model Can't Answer
Every systems engineer asks them instinctively. The model rarely answers them. Here's what changes when it is smart enough to answer back.
The Thirty-Year Inversion
For three decades, value moved from atoms to bits. That era is ending. What happens when the arrow reverses — and why the bottleneck nobody invested in is about to matter more than anything else.
Every System Has a Pyramid
How the Pyramid of Causality reveals why your system works — or why it doesn't
Your Engineering Deserves a Pipeline, Not a Chatbot
Why the five-stage AI pipeline in Cairn exists — and what it replaces
The Dead Paths Are the Point
What dendrites teach us about designing complex systems — and why the most important engineering decisions are the ones you didn't make