Local speed does not guarantee shorter delivery

Takt is available production time divided by demand; cycle time describes process completion; lead time spans order or release to finish including wait and rework.

A faster non-constraint can only add WIP. The bottleneck is the resource or rule limiting throughput under a particular product mix and window.

Freeze demand and time boundaries

Define shifts, breaks, planned stop, changeover, demand, product family, good unit, and observation period.

Separate procurement, production, and customer-order lead times. Names without start and end events are ambiguous.

Connect order, work order, and operation events

Persist route version, resource, product, start, end, queue, good, rework, and scrap under stable event IDs.

MES completion alone cannot explain wait; PLC state alone cannot identify the order. Report unmatched events.

Use distributions, not only average cycle

Review median, P90, product and shift distributions, micro-stops, and causes. Cycle below takt still fails when availability and variability create shortage.

Retain legitimate slow records because the tail often contains the improvement opportunity.

Relate WIP and lead time carefully

In a stable bounded system, Little’s Law offers a reasonableness check: lead time is approximately WIP divided by throughput.

It is not an exact order formula and fails under inconsistent boundaries, non-steady state, or duplicated rework. Compare it with event-measured lead time.

Identify constraints under product mix

Estimate load from demand times standard work over availability, then combine queue, utilization, failure, and setup. Routes make the constraint move by shift and mix.

High utilization is not automatically the bottleneck; inspection release, materials, and batching rules can constrain flow.

Avoid local-efficiency overproduction

Equipment-only output targets encourage non-constraints to build WIP. Pace them to system flow and protect a controlled buffer before the constraint.

Protect and improve the constraint before buying faster equipment. Local capital may deliver no system result.

Validate through scenario and pilot

Model mix, shifts, batches, setups, and failure, then pilot one value stream with throughput, lead time, WIP, delivery, quality, and overtime guardrails.

Observe constraint movement and avoid mistaking one backlog-clearance burst for durable improvement.

Acceptance checklist

Verify all time definitions, event completeness, route version, good-unit rule, WIP conservation, rework closure, cycle distribution, load, and order lead time.

Replay cross-shift, expedite, rework, shortage, setup, and failure cases. Field owners must explain dashboard-to-shift-report differences.

BI0 boundary

Pilot one product family, reconcile orders and operations, replay a full cycle, and publish distinct takt, cycle, lead, WIP, and constraint views.

BI0 may be evaluated for manufacturing integration and bottleneck analysis. PLC or MES connectivity, latency, simulation, and control require project verification; no unique bottleneck or lead-time reduction is guaranteed.

Public references

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