Enhancing the Integration of Vulnerable Refugees in Luxembourg: Findings from a Randomized Controlled Trial (IDEALUX)

Last registered on October 06, 2025

Pre-Trial

Trial Information

General Information

Title
Enhancing the Integration of Vulnerable Refugees in Luxembourg: Findings from a Randomized Controlled Trial (IDEALUX)
RCT ID
AEARCTR-0016880
Initial registration date
October 06, 2025

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
October 06, 2025, 3:32 PM EDT

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

Locations

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Primary Investigator

Affiliation
J-PAL Europe

Other Primary Investigator(s)

PI Affiliation
LISER
PI Affiliation
Uppsala University
PI Affiliation
Stockholm School of Economics

Additional Trial Information

Status
In development
Start date
2025-10-19
End date
2026-12-01
Secondary IDs
Prior work
This trial does not extend or rely on any prior RCTs.
Abstract
Large employment and unemployment gaps persist between refugees and other migrants across Europe; refugees are 11.6 percentage points less likely to be employed and 22 points more likely to be unemployed than otherwise similar migrants (Fasani et al., 2022). Linguistic barriers are repeatedly identified as the key obstacle for economic and social integration (Lochmann et al., 2018). A growing experimental literature demonstrates that combining language training with job-search or work-practice components can generate large gains in refugee employment. Randomised controlled trials of refugee integration in Europe have examined a variety of interventions, such as occupation‑specific job‑search intermediation in Germany (Battisti et al., 2019), intensive counselling in Sweden (Andersson Joona & Nekby, 2012) and combined language‑plus‑placement schemes (Dahlberg et al., 2024). Yet, no study to date has isolated the direct effect of intensive language training and how changes in language skills contribute to refugees’ integration, leaving an important evidence gap that the present project addresses.

This randomised controlled trial will evaluate the causal impact of intensive French language courses tailored to labor market shortages in Luxembourg on a variety of economic and social integration outcomes of refugees. The intervention is delivered through the PARLE program, implemented by EFID, a non-profit organization that promotes social cohesion through a range of programs, including specialized professional French training for vulnerable populations such as refugees. The courses focus on professional vocabulary and targets the most vulnerable refugees, those without formal employment and who have very limited French skills. A total of 800 participants will be randomized: 400 in the treatment group, who will attend PARLE courses, and 400 in the control group, who will continue to access the standard support, training, and workshops offered by the National Office for Social Inclusion (ONIS).

Primary outcomes include dimensions observed in the administrative data such as job reactivation (registering in the unemployment agency), employment status, monthly earnings, contract stability, as well as educational outcomes (e.g., follow-up of training or enrolling in educational programs). We will carry out subgroup analyses by gender, education, household composition, language skills, and distance to the learning centers. Secondary outcomes include French language acquisition (measured by pre and post-intervention tests), job autonomy (e.g., being able to prepare a CV, search for jobs, do an interview, etc.), social integration, subjective well-being, and health, combining survey data with administrative records from the Social Security system and other public institutions. By focusing on the isolated effect of intensive language training, this study will provide frontier evidence to policy debates on refugee integration in Europe, addressing not only labor market outcomes but also social and health dimensions of inclusion. Furthermore, by accurately measuring refugees learning acquisition, it will provide key insights into how enhanced language skills translate into better integration outcomes, and how it can help refugees who are far from the labor market (inactive) make crucial steps to rejoin the labor force.
External Link(s)

Registration Citation

Citation
Fernandez-Sanchez, Martin et al. 2025. "Enhancing the Integration of Vulnerable Refugees in Luxembourg: Findings from a Randomized Controlled Trial (IDEALUX)." AEA RCT Registry. October 06. https://doi.org/10.1257/rct.16880-1.0
Sponsors & Partners

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Experimental Details

Interventions

Intervention(s)
The intervention consists of providing intensive French language courses through the PARLE program, implemented by EFID, a non-profit organization that promotes social cohesion through a range of programs, including specialized professional French training for vulnerable populations such as refugees. The courses will have a duration of 100 hours over 6 weeks, providing both general and professional vocabulary through a novel and dynamic curriculum, and specifically tailoring sectors with labor market shortages in Luxembourg and suited for refugees’ skills. Three different vocational tracks will be offered, allowing participants to choose the path that best suits their aspirations or prior experience. This research targets refugees out of the labor force, receiving social benefits, and who have limited French skills (below A2 level). A group of 400 participants (treatment group) will participate in these specialized courses, while another group of 400 participants (control group) will only have access to the standard training and workshops usually available through the National Office for Social Inclusion (ONIS).
Intervention Start Date
2026-01-01
Intervention End Date
2026-07-31

Primary Outcomes

Primary Outcomes (end points)
Job reactivation (registering in the unemployment agency)
Any paid employment (employment status after course completion).
Monthly earnings.
Contract stability (open-ended versus fixed-term contracts, contract duration).
Educational outcomes (follow-up of trainings, enrollment in professional education or other)
Heterogeneous treatment effects by gender, educational attainment, household composition, language skills, and distance to the learning centers, using pre-specified subgroup analyses.
Primary Outcomes (explanation)

Secondary Outcomes

Secondary Outcomes (end points)
French language acquisition (measured by pre and post-intervention tests)
Job autonomy (e.g., being able to prepare a CV, search for jobs, do an interview)
Index of social integration (frequency of contact with Luxembourgers, civic engagement, language use at home and in public).
Self-reported well-being.
Secondary Outcomes (explanation)

Experimental Design

Experimental Design
This research targets refugees in Luxembourg. A group of 400 participants (treatment group) will participate in specialized French courses provided by EFID, while another group of 400 participants (control group) will only have access to the standard support, training, and workshops usually available through the National Office for Social Inclusion (ONIS).
Experimental Design Details
Not available
Randomization Method
Randomization done in office by a computer
Randomization Unit
Individual
Was the treatment clustered?
No

Experiment Characteristics

Sample size: planned number of clusters
800 refugees in Luxembourg
Sample size: planned number of observations
800 refugees in Luxembourg
Sample size (or number of clusters) by treatment arms
400 in treatment and 400 in control
Minimum detectable effect size for main outcomes (accounting for sample design and clustering)
IRB

Institutional Review Boards (IRBs)

IRB Name
Etikprövningsmyndigheten (the Swedish Ethical Review Authority)
IRB Approval Date
2025-09-22
IRB Approval Number
Dnr 2025-05509-01