On the impact of union led training on working conditions

Last registered on August 18, 2022


Trial Information

General Information

On the impact of union led training on working conditions
Initial registration date
August 17, 2022

Initial registration date is when the trial was registered.

It corresponds to when the registration was submitted to the Registry to be reviewed for publication.

First published
August 18, 2022, 3:25 PM EDT

First published corresponds to when the trial was first made public on the Registry after being reviewed.



Primary Investigator

Labore - Labour Institute for Economic Research

Other Primary Investigator(s)

PI Affiliation
University of Helsinki
PI Affiliation
VATT Institute for economic research

Additional Trial Information

On going
Start date
End date
Secondary IDs
Prior work
This trial does not extend or rely on any prior RCTs.
This study aims to evaluate the impact of union provided training on working conditions in developing countries. The study will be made in three different provinces of Mozambique and include unions from five different sectors. The treatment will be offered to a random sample of union representatives and it consists of training on how the union is organized, the workers’ rights, negotiation skills and recruitment of new union members.
External Link(s)

Registration Citation

Carnicelli, Lauro, Tuomas Kosonen and Jukka Pirttilä. 2022. "On the impact of union led training on working conditions." AEA RCT Registry. August 18. https://doi.org/10.1257/rct.9943-1.0
Experimental Details


Intervention Start Date
Intervention End Date

Primary Outcomes

Primary Outcomes (end points)
We are going to measure whether union training activities have an impact on:
A) The real outcomes of all workers in the workplace, such as salary, working hours, number of employees, benefits, availability of safety procedures and equipment, number of work-related accidents and illness, occurrences of detrimental work-related practices and delays in payment.
B) The subjective wellbeing and satisfaction of union representatives, such as whether they know what they should do as union representatives, whether they know the labor laws and union- and working conditions- related regulations, to what extent they benefited from the education in terms of enforcing these things or in general learning the content being educated, how satisfactory they see the actions of unions, and whether they deem unions as a vehicle to achieve work-place improvements.
C) The satisfaction of other workers in the workplace to their work content, work conditions, payments, and towards the unions.
D) Whether educating individuals in the proposed way promotes the goals of unions themselves, visible as the number of union members, share of firms with collective agreement or strength of activity related to unions.
Primary Outcomes (explanation)

Secondary Outcomes

Secondary Outcomes (end points)
Secondary Outcomes (explanation)

Experimental Design

Experimental Design
The study uses a Randomized Control Trial design. A sample of unionized firms will be randomly selected into the treatment group. This randomization will occur after the baseline survey. The union representatives of the firms that are in the treatment group will be invited to participate in the training. 50% of the firms are allocated to the treatment group and 50% are allocated to be part of the control group. Four worker per firm, including the union representative, will answer a baseline and a follow-up survey.
The participants of the training sessions, the treated union representatives, will make two tests. One before the start of the training and another at the end of the activities.
Experimental Design Details
Randomization Method
Made in office by a computer and stratified by province and union.
Randomization Unit
Randomization at the firm level
Was the treatment clustered?

Experiment Characteristics

Sample size: planned number of clusters
175 firms
Sample size: planned number of observations
700 workers
Sample size (or number of clusters) by treatment arms
85 firms
Minimum detectable effect size for main outcomes (accounting for sample design and clustering)

Institutional Review Boards (IRBs)

IRB Name
IRB Approval Date
IRB Approval Number


Post Trial Information

Study Withdrawal

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Is the intervention completed?
Data Collection Complete
Data Publication

Data Publication

Is public data available?

Program Files

Program Files
Reports, Papers & Other Materials

Relevant Paper(s)

Reports & Other Materials