Review the evidence signals before interviewing. Then use the anchored descriptions—not instinct alone—to choose the score that best matches each answer.
01
Evaluation factor
Technical depth
35% weight
Probe command of ISO 14644 class limits, HEPA/ULPA and laminar flow behaviour, differential pressure cascades, viable and non-viable particle monitoring, and the specific process steps they owned (litho, wet etch, CVD, fill-finish).
Evidence to listen for
Explains the physics or mechanism behind their work, not just the tooling
Names the standards, tolerances, and constraints they designed against
Can defend a design decision under follow-up questions
Distinguishes what they personally engineered from what the team delivered
Five-point scoring guide
1
Poor
Cannot explain the fundamentals of their own stated specialism.
2
Needs Improvement
Knows the vocabulary but not the underlying mechanism; struggles under follow-ups.
3
Satisfactory
Solid working knowledge for the role; depth thins out on edge cases.
4
Very Good
Strong command of the domain; explains trade-offs and defends decisions well.
5
Excellent
Cites class limits, air change rates and recovery test data from memory, and links contamination sources to named process steps.
02
Evaluation factor
Work that shipped
30% weight
Ask what they released: qualified tools, validated process recipes, IQ/OQ/PQ packages, gowning or cleaning SOPs, and yield or defect density numbers before and after their changes.
Evidence to listen for
Names specific programmes, parts, or systems that reached production or field use
States their own scope inside the project
Can give measured outcomes: yield, cycle time, cost, failure rate
Explains what went wrong and what they changed
Five-point scoring guide
1
Poor
No delivered work; experience is coursework, lab-only, or purely observational.
2
Needs Improvement
Contributed to projects but cannot say what shipped or what their part was.
3
Satisfactory
Has delivered real work; outcomes described without numbers.
4
Very Good
Names shipped work and their scope, with some measured results.
5
Excellent
Names specific tools qualified and processes transferred, with quantified yield, particle count or scrap reductions they personally drove.
03
Evaluation factor
Diagnosis under uncertainty
20% weight
Test how they chase an excursion: rising 0.5 micron counts, unexplained defect signatures on wafer maps, or failed environmental monitoring, using SPC charts, DOE, fishbone and cross-section or SEM evidence.
Evidence to listen for
Describes a real failure they chased to root cause
Shows a method: isolate variables, reproduce, measure, eliminate
Distinguishes correlation from cause
Says what they ruled out and why, not only what the answer turned out to be
Five-point scoring guide
1
Poor
No diagnostic method; guesses or escalates immediately.
2
Needs Improvement
Trial and error with no structure; cannot explain how they narrowed the cause.
3
Satisfactory
Reasonable method on familiar problems; less structured on novel ones.
4
Very Good
Clear systematic approach with a real root-cause story.
5
Excellent
Walks through one real excursion with data at each step, distinguishing tool, personnel, gowning and HVAC root causes convincingly.
04
Evaluation factor
Working across the org
15% weight
Assess how they work with facilities, QA, production operators and equipment vendors on change control, gowning discipline, shutdown scheduling and CAPA closure without stalling output.
Evidence to listen for
Explains technical constraints to non-technical stakeholders without condescension
Has negotiated scope, cost, or timeline with manufacturing, product, or suppliers
Documents decisions so others can act on them
Takes review feedback without defensiveness
Five-point scoring guide
1
Poor
Cannot communicate outside their specialism; dismissive of other functions.
2
Needs Improvement
Communication gaps cause rework; avoids stakeholder contact.
3
Satisfactory
Works adequately with other teams; documentation is thin.
4
Very Good
Communicates clearly across functions; reliable collaborator.
5
Excellent
Describes negotiating change control and operator behaviour changes with named counterparts, holding line uptime while contamination controls tightened.
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