Five readiness gaps that delay a new fab ramp.

A new line is planned around the dates its tools arrive. The ramp is decided by five things that are not on the tool-delivery schedule at all.

In brief
  • Ramps slip on readiness more often than on technology.
  • The five gaps are crews, suppliers, qualification, shift-level problem solving and customer audits.
  • Each gap sits between departments, so each is an ownership problem before it is a technical one.
  • Four questions, asked early of every item the ramp depends on, expose most of them.

Ask the team building a new fab, OSAT or ATMP line what could delay it, and the first answers are usually about construction and equipment lead times. Those risks are real, but they are also the most visible and the most managed. The delays that surprise leadership teams tend to come from somewhere else: the line is physically ready and still cannot produce to plan.

Here are the five gaps we see most often, and what closing each one early looks like.

Planned ramp versus a ramp that waits on readinessTwo S-shaped output curves across five phases: tool-in, qualification, pilot lots, ramp and volume production. The second curve lags the plan; the area between them is output that was planned but not shipped. The shape is illustrative.Tool-inQualifyPilot lotsRampVolumeOUTPUTRamp as plannedRamp when crews,suppliers or audits lagoutputnot shippedIllustrative shape, not measured data
Fig. 01Two ramps for the same line. The shaded area is planned output that was not shipped. Illustrative shape, not data.
  • Crews arrive after the tools
  • Suppliers found during the first shortage
  • Qualification treated as paperwork
  • Problems contained, not solved
  • Customer audits discovered late

1. Crews arrive after the tools

A tool that is installed and qualified but has no certified operator on the night shift is, for output purposes, not installed. Hiring plans are often built forwards from building handover and expressed in headcount. The line needs something more specific: a certified person for each tool on each shift.

Timing matters as much as numbers. Technicians who join during installation learn the tool from the vendor’s own engineers. Those who join afterwards learn it from a manual and from each other.

Closing it early: build the hiring plan backwards from tool-in dates, phase the joining dates, and track certifications instead of headcount.

2. Suppliers are found during the first shortage

In a new region, most materials, spares and specialist services start out imported. That is unavoidable at the beginning. What is avoidable is discovering, on the day a part fails, that the nearest replacement or repair shop is a customs clearance away.

Closing it early: map import dependence by category before the ramp, and start qualifying nearby sources for the low-risk categories first. Our note on what to localise first sets out an order.

3. Qualification is treated as paperwork

Qualification is the evidence that a tool, a process or a product does what it should, repeatedly. When it is planned tool by tool, the tools get signed off and the product still is not ready, because nobody planned the sequence from the product’s point of view.

Closing it early: plan qualification from the first product milestone backwards, and give one person ownership of the whole sequence and its documents.

4. Problems are contained, not solved

Early in a ramp, every team is thin. When something goes wrong, engineers contain it and move to the next fire. The cause stays in the line, and the same problem returns a few weeks later on a different shift.

Closing it early: install a simple routine from the first lot. Every excursion gets an owner, a root cause and a change to standard work, and it is not closed until all three exist.

5. The customer audit is discovered late

For assembly and test lines especially, customers qualify the line before they load it. A quality system written in the weeks before the audit describes a factory that does not yet exist, and auditors can tell.

Closing it early: write procedures for the line you are running, from the first lot, and rehearse the audit on every shift well before the customer arrives.

What the five have in common

Each gap sits between departments. No single function naturally owns it, so it is measured in the wrong unit until it becomes urgent.

GapHow it is usually trackedHow it should be tracked
CrewsBy HR, in headcountBy the production head, in certified people per tool per shift
SuppliersBy procurement, on priceBy supply chain and quality together, on qualification status
QualificationBy engineering, tool by toolBy a programme lead, against the product milestone
Problem solvingBy whoever is on shiftBy the module owner, with a closure routine
Customer auditBy quality, near the dateBy the plant head, from the first lot

A four-question test

You do not need a large programme to find these gaps. For each thing the ramp depends on, ask:

  1. What must be true by the milestone?
  2. What is true today?
  3. Who owns the gap?
  4. What happens to the ramp if it slips?

If the third answer is “several people” or “nobody yet”, you have found a readiness gap. It is cheaper to find it now.

A ramp is won before the tools arrive.

This is the method behind our Ramp Readiness Review. If you would like to talk it through for your own line, start a conversation.

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