Notes from the practice.
Notes on data leadership, methodology, architecture, and what 25+ years of analytics transformation taught us.
Eight posts on the most important infrastructure decision of 2026.
Published on the DirectionalData company page on LinkedIn over eight weeks. Each card below links to the live post.
The semantic layer just became infrastructure.
Five years ago this was a niche analytics-engineering term. As of January 2026, Gartner is calling it non-negotiable infrastructure on the same line as data platforms and cybersecurity.
Seven supporting posts.
The four-tools problem.
Forrester 2026: 61% of enterprises run 4+ BI tools and 25% run 10+. 84% of teams still hit conflicting versions of the same metric. The fix isn’t fewer tools — it’s one definition layer they all read from.
AI accuracy is a metric definition problem.
Text-to-SQL drops 50%+ on real enterprise warehouses. It climbs back to 90%+ with a semantic layer between the model and the data. The model isn’t the bottleneck. The metric layer is.
Day-2 architecture for the semantic layer.
Most semantic layers we see were designed for the company the team had eighteen months ago. Three Day-1 mistakes we see constantly, three questions to ask before naming a metric, and why rebuilds cost 5–10× what foresight does.
Stabilize, Improve, Leverage — applied to the semantic layer.
The methodology we’ve used for twenty years, mapped onto semantic-layer work. Most failed projects we inherit tried to Improve and Leverage simultaneously, before stabilizing. Here’s why the order matters.
Why the CFO should own the metric layer.
In most mid-market companies the metric layer sits under the CIO by default. That’s an org-design accident. Metric definitions are control activities — especially the moment an AI assistant starts answering executive questions.
The first 90 days of a semantic layer program.
Stabilize the conversation (weeks 1–2). Pick the platform and define ten metrics (weeks 2–6). First wave of BI + AI consumers (weeks 7–11). Stewardship live, backlog expanded (weeks 11–13). The pivot point is the first meeting where dashboards don’t disagree.
Open Semantic Interchange — what mid-market buyers should know.
A vendor-neutral standard finalized in January 2026. Sixteen-plus signatories. Metric definitions are now portable across platforms. The metric-rebuild portion of platform switching cost just got smaller.