Lean Quality Defects Control and Productivity Gains
RCTClinical Trial
Manufacturing establishments experience reduced total factor productivity and profit losses due to unanalyzed production defects, excess inventory deadstock, and unmonitored machine downtime.
Picture this
Imagine baking loaves of bread where many burn, but nobody notes which oven is causing the burns. When bakers log every burnt loaf by oven number and repair the overheating oven daily, fewer loaves are wasted, saving flour, energy, and labor previously spent scraping off burnt crusts.
What the evidence says
Adopting modern management practices reduced quality defects by 43.1% (p = 0.001), lowered yarn inventory by 21.7% (p = 0.060), increased output by 9.4% (p = 0.026), and increased Total Factor Productivity (TFP) by 16.6% (p = 0.061), yielding an estimated annual profit increase of $325,000 per plant.
- Who was studied
- 20 experimental plants (14 treatment plants, 6 control plants) across 17 multiplant cotton textile weaving firms in India.
- How
- Randomized Controlled Trial (RCT) implementing 38 lean operational practices (e.g., Quality Defects Index tracking, preventive maintenance) with weekly machine-log data collection over ~100 weeks per plant.
What to do
1. Establish a daily Quality Defects Index (QDI) board on the factory floor, logging defect types by loom and weaver, and review these logs during mandatory daily morning production meetings.
From the source
"We find that adopting these management practices raised productivity by 17% in the first year through improved quality and efficiency and reduced inventory..."
541 Management in India QJE.pdf