Operational, Capacity and Financial Results in Lean Accounting

Why it matters

When, after an improvement, workers do the same job in a shorter time, that is a meaningful operational result. But converting it directly into a money amount does not prove that an economic effect has arisen. If the same workers work for the same wage, the area is used at the same rent and the equipment creates the same expense, the total payment may not change. The gain first appears in capacity. This capacity can be used to meet additional demand, to prevent overtime or to do other necessary work. Counting all the freed time as a cash saving without seeing which use took place damages both expectations and trust in the improvement program. Lean accounting requires this transition to be shown openly.

The three areas read together answer different questions. The operational area shows flow results such as quality, delivery, cycle and inventory. The capacity area explains how the time of a defined resource was used. The financial result area shows period expenses, revenue and, where needed, the payment effect. None of these areas replaces another. With a quality improvement, rework may fall and capacity may open up, yet the expense may not have changed yet. In that case the improvement is not written off as a failure. The correct statement is that the operational gain has been realized and the condition for turning into a financial result is not yet complete. That way it can be seen at which stage the improvement stands.

In the capacity calculation, the resource and time basis must be held constant. Human time, machine time and calendar time are not the same quantity. When several workers work at the same time, total person-minutes differ from elapsed minutes. In this lesson, capacity is tracked as person-minutes of a defined resource group. The used part is set aside for the necessary production and support work. The available part can take additional work when safety, skill and equipment conditions are met. The unavailable part is time that could not be assigned to production in the defined period. The reason for this last part is entered in the record; not every unavailable minute is counted as waste that can be eliminated.

The sum of the three parts must equal the chosen capacity base. Otherwise lost time may have been counted twice, a job forgotten or the time basis changed. If, between periods, freed time moves into the available part, there is a visible conversion. Its economic use is tested separately: is there demand, are the other resources sufficient, can additional material be supplied, is the payment really falling? Assessing all these conditions also prevents two separate gains being written for the same resource. Time set aside for additional production cannot at the same time be used to reduce wages. The capacity table is therefore not a headcount-reduction target but the basis of a resource decision.

The distribution of available capacity over time is as important as its total. The uninterrupted time a job requires and the sum of short gaps spread across the day can be equal; even so, the job may not fit into those gaps. Similarly, while a worker is idle the required equipment may be busy, or the equipment may be free but no competent worker present. The second check of a capacity calculation is therefore that the resources able to do the job are present at the same time. Even if total person-minutes are sufficient, shift, skill and job-sequence constraints can limit feasibility. If the time that has opened up is spread across different people, combining it may require a new task distribution and a safe job definition. Until this arrangement is made, the whole total is not shown as set aside for an additional order. When a feasible part is found, the remainder does not disappear either; it is tracked with a separate availability condition. The same check prevents support work from being postponed. If the time opened for production comes from necessary maintenance or quality checks being left invisibly for later, it is not accepted as a real and sustainable capacity gain.

Formula