Deterministic Process

An operational process whose output is entirely predictable from its inputs—the same inputs, applied consistently, produce the same output every time without requiring human judgment at any step.

Deterministic processes are the only processes suitable for full automation; processes that appear deterministic but contain hidden judgment calls and edge cases that are handled informally by experienced operators. It leads to automation failures that are difficult to diagnose because they fail only when the edge case occurs.

Identifying whether a process is genuinely deterministic is the most important step in any automation evaluation and the most frequently skipped.