Excel Consulting Services in Norton, VA

Most often it is measuring real lead time per supplier and item — order date to receipt date, with the spread rather than just the mean — from purchase history you already keep.

After that it is sizing safety stock against variability instead of the average, setting a service level per item, and stating a reorder point where the buying happens.

Because a long but reliable lead time is easy to plan around — you order that far ahead and nothing goes wrong. An unpredictable one cannot be planned around at all.

The buffer has to cover the slow case rather than the typical case, so a supplier who takes between two and seven weeks costs you far more stock than one who always takes six.

It guarantees failure about half the times the supplier runs late, which is exactly why the same few items keep running out with no apparent cause.

Safety stock exists to cover variability. Sized against an average it is not safety stock at all, it is just stock.

Usually less in total, which surprises people. The buffer typically needs to grow on a handful of genuinely variable items and can shrink considerably on many steady ones.

So total stock often falls while availability improves, because the capital moves from where it was never needed to where it always was.

Per item and deliberately, because the price of availability is not linear. The last few percentage points cost far more in stock than the preceding improvement did.

Higher for anything that stops production or loses a customer, lower for anything that can wait a week. Choosing per item is what makes the whole exercise affordable.

Yes, and it changes the conversation completely. The extra buffer their unpredictability forces you to hold has a financing cost, calculable per supplier and per year.

That lets you say what their variability costs and what you would pay for a firmer commitment — and it tests whether a nearer, dearer supplier is actually more expensive.

Scope decides it, which is why the records are examined before any figure is named and why that examination is free. Measured lead times with sized buffers is fixed-price.

In every case the deliverable and the price are agreed in writing before any building begins.

The work is delivered remotely by design rather than by limitation. Going through purchase orders and receipts together on a shared screen is identical at any distance.

It also means a supplier meeting close now gets looked at today, and no part of the invoice is travel.

It works until the week they are away, which is reliably when stockouts cluster. The knowledge is real and it is not written down anywhere.

A stated reorder point per item captures it as a rule, and it is also the only form in which the logic can be checked or improved.

Measured lead times with buffers and reorder points is often under a week once order and receipt dates can be paired. Adding supplier costing and a monthly resize usually runs two weeks.

Whatever the size, that estimate is committed in writing before building starts rather than emerging as the work proceeds.

The workbooks, any macro source code, a written note of how each buffer and service level was set and why, and training for whoever will maintain it.

Nothing is locked to us and no subscription is needed to keep it running. Support afterward is available and entirely optional.

No. They describe where most of the work has come from rather than what is accepted, and what decides scope is the nature of the problem rather than the sector.

A production component, a retail line and a clinical consumable are all protected by the same buffer arithmetic.