Skill Signaling via Dual Certification

In Simple Words

Imagine learning to cook in a local diner where only the head chef knows how good you are. A dual certification is like receiving an official state culinary diploma—it proves to any restaurant in the country that you have mastered standard recipes, allowing you to get hired anywhere for higher pay.

Research question

Traditional informal apprenticeships lack standardized testing and external verification, making acquired skills firm-specific and non-transparent to external employers. Worker mobility and medium-term wage growth remain constrained without objective signaling mechanisms.

Participants

N = 1,670 youth respondents tracked at endline (4 years post-baseline) across 7 urban localities in Côte d'Ivoire.

Study Design

Longitudinal tracking evaluating formal skill certification rates and corresponding 4-year labor market earnings.

Results

Subsidized dual apprentices achieved a 15.1 percentage point higher rate of formal skill certification (p < 0.0001) relative to a 9.5% control mean, contributing to a 15% increase in total earnings (9,394 FCFA/month, p = 0.0169) 2 years post-program completion.

Takeaway

Combine external theoretical exams with standardized practical assessments to provide portable skill certification that overcomes labor market information asymmetries.

Read alongside the research

Plain-English glossary

Original explanations, informed by the references below. Examples are illustrations, not data from the studies above. The research text stays unchanged.

Longitudinal study

A study that checks the same group of people at different times. This lets researchers examine how things change over time.

ExampleResearchers ask the same workers about their wellbeing at the start, after three months and after six months.

NICE · Longitudinal study ↗Read more about longitudinal study →

Baseline

The starting measurements in a study. Researchers use these to compare what participants were like at the start with what happens later.

ExampleBefore a training programme starts, researchers measure workers’ earnings. That first measurement is the baseline.

GET-IT glossary · Baseline characteristics ↗Read more about baseline →

Percentage points

The difference between two percentages.

ExampleA rise from 40% to 50% is 10 percentage points. Relative to the starting value, that is a 25% increase.

Office for National Statistics · Percentages ↗Read more about percentage points →

Related findings

• Experience-Based Recruitment Bottleneck →Labour & employment

  Imagine a delivery company that requires every driver applicant to show a five-year clean driving record before handing them the keys to a van. Because teenagers entering the workforce have zero years of driving history, the vans sit parked in the lot empty while young applicants stand outside wondering why their newly earned driver's licenses are being ignored.

• Public Skill Certification →Labour & employment

  Public skill certification functions like a verified inspection stamp on a used appliance. Instead of a buyer guessing whether a machine works, a trusted third-party inspector tests it and attaches an unforgeable label showing its performance rating so buyers can choose confidently.

• Skill Certification and Signaling Workshop →Labour & employment

  Standardized skills testing combined with job application training provides job-seekers with trusted skill certificates. This operates like a standardized quality tag on an unbranded product, enabling buyers (employers) to quickly verify value without relying on costly trial periods.

• Skill Signaling via Reference Letters and Certificates →Labour & employment

  Imagine a seller trying to sell a used car without an inspection report; buyers assume the worst and bid low, or walk away entirely. Standardized reference letters or skill certifications act like an independent mechanic's multi-point inspection report, giving buyers immediate proof of quality and eliminating buyer hesitation.