SERVICES
│ Supplementary course
Exhaust the combinations of conditions
A "thinking method that exhausts the combinations of conditions," usable in every setting — operational design, system design, decision-making. Internalize the template with three worked examples (operations / CRUD / status transitions).
─ ARTICLE COVER
Foundational Thinking ／ Supplementary course
§I ─ POSITION
A supplementary course of the DX-project curriculum. A shared skill for discovering gaps in every setting across Ph.1 to Ph.6.
§II ─ TAKEAWAYS
Exhaust by expanding conditions into an "axis × axis" matrix
Use it appropriately across the three example-based patterns of operations / CRUD / status
Reduce the after-the-fact regret of "I should have noticed if I'd thought about it"
§III ─ EXCERPT
¶ 01
Gaps in requirements definition, overlooked boundaries in business workflows — 70% of these come down to whether you hold a "template of how to think." Bird's-eye thinking builds the habit of setting up axes and fully enumerating the combinations.
¶ 02
The three patterns that recur most in practice. Keep these as "templates."
¶ 03
Choose the wrong axes and the matrix dies. Pick from one of "an axis where the targets increase or decrease," "an axis that branches by condition," or "an axis that changes over time." Example: for CRUD, "role (increase/decrease) × operation (branch)"; for status transitions, "state (time) × event (branch)."
¶ 04
Try to fill every cell and you'll give up. At first, fill them coarsely on three levels: "○ / ✗ / unclear." The "unclear" cells become the points for additional discovery or analysis. Perfectionism aimed at producing a "sense of having done it" in requirements definition is the enemy.
¶ 05
The root cause of gaps is seeing only "the one cell currently being discussed." For example, in a meeting where you're talking "for small and mid-sized firms…," "what about large firms?" gets dropped later. The problem is not defining, before the discussion, "what combination of axes is this about?"
| New inquiry | Existing inquiry | Complaint | |
|---|---|---|---|
| Large firms | ? | ? | ? |
| Mid-sized firms | ? | ? | ? |
| Small firms | ← talking about now | ? | ? |
¶ 06
There's a right time to use bird's-eye thinking. Always making a table is a waste. It triggers when the following three conditions are met.
§∞ ─ DOWNLOAD
─ EXERCISE
A worksheet plus 6 exercises and a test. Through real examples, internalize "how to choose the axes" and "how to fill the combinations."
Lecture slides
Every slide of the course
Cheat sheet
Quick reference for the field
Exercises
With answers and grading
Advanced / test
Hands-on plus rubric
INCLUDED PDFS ─ 7files
§IV ─ RELATED