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The Operation Bulletin gives a number — how many operators and machines an order needs in total. Manpower planning is the next, harder step: matching real people, with real skill levels, to the specific operations that need them. A factory can have 45 machines and 45 operators and still fall short, if only three of them can actually run the machine a bottleneck operation needs.
Most factories maintain a skill matrix — a record for every operator showing which machines and operations they can run, and how efficiently. Operators are commonly graded (e.g. A/B/C), based on things like how many different operations they can perform and their proven production speed and quality. This turns absence coverage and new-style staffing from a guessing game into a quick lookup.
Some operations need an operator's full, continuous attention (a 1:1 ratio). Others — where a machine runs a cycle largely on its own, like some pressing or fusing operations — let one operator load and monitor two or three machines at once (a 1:2 or 1:3 ratio). Planning this correctly is a real cost lever: assuming 1:1 everywhere when 1:2 is achievable means paying for operators who are partly idle.
The line can't hit its target, output falls behind, and the factory ends up relying on overtime or a delayed delivery to catch up.
Labour cost rises, and idle or underutilised operators often become a hidden productivity drag rather than a safety margin.
Both problems trace back to the same root cause — planning manpower on assumption or headcount alone, instead of on actual SMV data and a real skill matrix.