Theory Card 074 — Verification Discipline / Implement
Research lens
Verification discipline is the habit of testing, checking edge cases, and reviewing whether a solution matches the original requirement. In the Implement stage of BASIC, the goal is to execute the chosen plan in controlled order. That makes this concept especially relevant here, because it shapes how much mental work the candidate is trying to carry at once and what gets made explicit.
Why it matters in SWE interviews
Interviewers notice immediately when a candidate hands over code or architecture without validating it. The Check stage makes verification an explicit deliverable rather than an optional flourish. In practice, Implement is where the candidate should ask: How do we write or walk through the solution one stable layer at a time? That question acts like a cognitive boundary. It protects the answer from turning into an unstructured search.
BASIC move
A strong move here is to transcribe the plan instead of improvising. For Verification Discipline, that means deliberately naming the important units instead of juggling them implicitly. The interviewer sees cleaner reasoning, and the candidate benefits from keeps execution disciplined and easier to debug.
Common miss
The miss is ending the answer as soon as a plausible solution appears. When that happens, the candidate usually feels busy, but the answer is actually becoming less inspectable.
Practice prompt
“While practicing, pause at the Implement step and explain how Verification Discipline changes the way you would handle the prompt.”