Intra-Production Line Soft Skill Productivity Spillovers
Evaluating on-the-job training at the individual level ignores peer externalities in sequential team production environments where unmanaged bottlenecks by one worker slow down entire assembly teams.
Picture this
Imagine a water pipeline where a few rusted valves cause water flow to back up along the whole line. When a subset of line operators learns to clear clogs and communicate better, water flows smoothly across the entire pipeline, benefiting neighboring operators who never received new tools themselves.
What the evidence says
Untrained workers on treatment lines accrued 8.02 additional person days during treatment (p < 0.05) and experienced efficiency gains of 7.14 percentage points post-treatment (over two-thirds the size of direct treatment effects), leading to an overall line-level efficiency increase of 4.31 percentage points (p < 0.05).
- Who
- N = 837 untrained spillover workers on treatment lines compared against 779 control workers on control lines across 112 garment assembly lines in Bengaluru, India.
- How
- Two-stage randomized controlled trial (RCT) where lines were first randomized to treatment/control, and enrolled workers on treatment lines were randomized to direct P.A.C.E. training or untrained spillover status.
What to do
Structure team-based manufacturing workflows to distribute soft-skills-trained workers across assembly units to capture peer efficiency spillovers without paying to train 100 percent of the workforce.
From the source
"Line level results are also consistent with individual-level results... we still find a significant productivity increase of roughly 8% of the mean."
Returns_to_On_the_job_Soft_Skills_Training_Adhvarya_Kala_Nyshadham.pdf