Apparel Production and Quality Control
What this domain tests
The production domain follows an order from fabric inspection through cutting, sewing, finishing and dispatch. The exam tests sequence, marker efficiency, work measurement, line balancing, and the difference between quality control and quality assurance.
Core rules and concepts
- Cutting room sequence: fabric inspection → spreading → marker placement → cutting → numbering/bundling → fusing → issuing to the line.
- Marker efficiency: (area of pattern pieces ÷ marker area) × 100. A higher value means less fabric waste; grain, checks, stripe matching and nap constrain the marker.
- Work measurement: SAM (standard allowed minutes) is the time allowed for a task at a defined performance level. It supports costing and line balancing.
- Line balancing: allocate operations so workstation times are close to the takt time; the slowest operation is the bottleneck and controls output.
- QC vs QA: QC inspects and rejects output; QA builds systems and procedures to prevent defects.
- Inspection: incoming fabric, in-process checks and final inspection. The 4-point system assigns penalty points for fabric defects; AQL sampling accepts or rejects a lot on a defined sample size.
- Defect classes: critical (unsafe or illegal), major (unsaleable or obvious), minor (small appearance faults).
Worked example
An order uses a marker of 6.0 m². The pattern pieces total 4.5 m². Marker efficiency = 4.5 ÷ 6.0 × 100 = 75%. If a revised marker fits the same pieces into 5.4 m², efficiency = 4.5 ÷ 5.4 × 100 = 83.3%, saving 0.6 m² of fabric per lay. On a 100-layer lay, that is 60 m² saved.
Traps that cost marks
- Treating final inspection as the only quality activity; prevention belongs upstream.
- Confusing SAM with actual time taken by a slow operator.
- Improving marker efficiency by ignoring grain or pattern matching, which creates unsaleable garments.
- Mixing critical and minor defects, leading to wrong accept/reject decisions.