Capacity, Quality and Safety Gates at Launch

Why it matters

A launch gate is the transition condition that turns the decision “it looks ready” into measurable evidence. Output quantity, quality and safety are assessed at the same time. Completing the target quantity once does not show that the line can run repeatably. During the pilot, extra workers, unusual maintenance support or corrections made afterward may have rescued the result. If these supports are removed from the record, a wrong capacity is carried into the normal resource plan. The question of the gate decision is not only how many products came out. It also asks with which resource, in what time, with what acceptance result and with what safe method they came out. A pilot whose boundaries are not clear cannot produce a reliable transition decision.

The first-time-right rate tracks the products that come out of the defined process conforming without rework or correction. The final conforming output can show the acceptable product quantity after the necessary corrections. These two rates answer different questions. Even if all products are conforming at the end of the correction, the quality problem that arose in the first pass and the resource spent do not disappear. Counting the entry of the same product into rework as a newly produced product also inflates the quantity. Product identity and the flow record are therefore preserved. First conformance, correction, scrap and pending decision are kept apart. An open acceptance result is not assumed to be conforming.

The capacity gate looks for whether sufficient good output can be sustained with the defined product mix and resource. Period time does not consist only of clean processing cycles. It is shown where setup, stoppage and rework load occur. If there is a separate correction resource, this resource is also included in the system boundary; it is not added to the main line's time without explanation. If the resource is shared, rework can consume the time for producing new products. A high final conforming output must not hide this effect. Closure is sought between the starting and ending stocks, the products entering the trial and the products accepted. A missing time record limits any firm capacity claim.

The safety gate cannot be averaged with the other indicators. Meeting the production target does not make an open hazard acceptable. Nor does the absence of an accident show that the protective function has been verified. As much as normal production, adjustment, removal of a jammed part, cleaning and maintenance access must also be assessed under the relevant safe working conditions. The criterion for each gate is defined before the trial; loosening the threshold after seeing the result does not produce evidence. For a gate that is not passed, a correction, a retest and an owner are determined. An open gate is not skipped just because the schedule has arrived. The go-ahead decision is recorded openly with its condition, its scope and its remaining uncertainty.

Formula