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The impact of providing vocational training to young men on labour outcomes and attitudes towards migration in northern Guinea-Bissau.

Last registered on June 24, 2021


Trial Information

General Information

The impact of providing vocational training to young men on labour outcomes and attitudes towards migration in northern Guinea-Bissau.
Initial registration date
March 27, 2021

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
March 29, 2021, 11:02 AM EDT

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

Last updated
June 24, 2021, 9:42 AM EDT

Last updated is the most recent time when changes to the trial's registration were published.



Primary Investigator


Other Primary Investigator(s)

PI Affiliation
NOVAFRICA, Universidade Nova SBE

Additional Trial Information

On going
Start date
End date
Secondary IDs
Iniziativa di emergenza a protezione della popolazione più vulnerabile, degli sfollati, rifugiati, migranti irregolari e migranti di ritorno in Senegal, Guinea Bissau, Guinea, Gambia e Mali AID 11659 - AICS Sede di Dakar // Progetto GOT - Générer des Opportunités de Travail sur la route Guinée Bissau - Sénégal - Mali PROG.ENGIM/REG/11659/3
As in most of Sub-Saharan Africa, the lack of quality employment among the rural youth is threatening economic development and inclusive growth, with employment search arguably working as an important driver for both internal and international migration. Active labour market policies, such as vocational trainings, are frequently chosen by governments, international institutions and NGOs as a potential solution to these labour market frictions. Nevertheless, the causal evidence determining the impact of these programs on the youth of rural areas is scarce in the sub-region, and inexistent in Guinea-Bissau. In this project, we run a randomized controlled trial within the GOT project implemented by the NGO ENGIM. This project provides vocational training courses on professional skills thought to be particularly relevant in the local context, and facilitates traineeships in local businesses for young men in two northern regions of the country, aiming to prevent their engagement in irregular migration practices. Assessing the impact of the GOT project on the employment rates, income and attitudes towards migrations of its trainees should contribute to a better understanding of the impact of active labour market policies in rural areas of low income countries, facilitating a better design, implementation and evaluation of such programmes in Guinea-Bissau and similar contexts.

Registration Citation

Alvarez Pereira, Brais and Carlos Alberto Coca Gamito. 2021. "The impact of providing vocational training to young men on labour outcomes and attitudes towards migration in northern Guinea-Bissau.." AEA RCT Registry. June 24.
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Experimental Details


This intervention seeks to improve the matching process between the labour supply and demand of young male workers in the countryside of a low-income country, specifically in the Guinea-Bissau’s regions of Cacheu and Oio. To do that, we randomized a sample of youth male workers from both regions, fulfilling some selection criteria (low-income, age between 18-34 and migratory profile), into a treated and a control group. The first group receives vocational training, entrepreneurship support and traineeship in local firms, in order to increase their human capital and ease their access to the local labour market. The control group is used as a benchmark to assess the impact of the program on personal income, employment status and attitude towards migration of the treated group.
Intervention Start Date
Intervention End Date

Primary Outcomes

Primary Outcomes (end points)
Our theory of change suggests that if we ease the skill matching process between labour demand and supply in local labour markets, individual labour market outcomes will improve. The most important expected outcomes are:
Probability of active employed status: both the acquisition of professional skills via vocational training and on job training through an internship should ease the matching between the beneficiaries looking for employment and the open vacancies in the region. Specially, traineeship in local firms could act as an entry gate to further formal employment. Moreover, entrepreneurship courses should provide beneficiaries with the necessary tools and resources to start up their own income generating activities, therefore acceding the self-employment status.
Higher personal income: acquisition of the professional skills actively demanded by local firms should lead to an increase in personal income via two different channels. Firstly, possessing the skills that are requested by firms should increase the employability of the beneficiaries and, hence, give them access to a paid employment. Secondly, such skills should be priced higher by firms than general skills and, hence, workers possessing them should get higher salaries than the average worker.
Lower willingness to emigrate: employment seeking is the main driver of internal and external migration in Guinea-Bissau. This is motivated by several factors like low wages, high rates of labour underutilisation and low quality of employments. Initially, our theory of change predicts that increasing personal incomes and employment levels among the beneficiaries should reduce their willingness to emigrate. However, there is a potential trade-off if salaries are higher abroad and participants improve their professional skills, which might lead to higher willingness to emigrate. Thus, we do not know which effect will dominate.
Primary Outcomes (explanation)
Willingness to emigrate is measured through the answer to three questions in cascade:
1. “Ideally, if you had the opportunity, would you like to move permanently to another country, or would you prefer to continue living in this country?”
2. Those who answer yes previously receive a follow-up question about concrete plans to emigrate—“Are you planning to move permanently to another country in the next 12 months, or not?”.
3. Those who answer yes to both the questions about desire and plan are asked a third question about active preparation to emigrate: “Have you done any preparation for this move (for example, applied for residency or visa, purchased the ticket, etc.)?”

• Measuring the answers to question 1: No=0, Yes=1/3
• Measuring the answers to question 2: No=1/3, Yes=2/3
• Measuring the answers to question 3: No=2/3, Yes=1
Scoring the indicator:
• 0= no willingness to emigrate
• 1/3= low willingness to emigrate
• 2/3= moderate willingness to emigrate
• 1= high willingness to emigrate

Secondary Outcomes

Secondary Outcomes (end points)
Secondary Outcomes (explanation)

Experimental Design

Experimental Design
A) Main research question
Do vocational training programs improve labour market outcomes, leading to a decrease in willingness to emigrate, in rural areas of low-income countries?

B) Timeline
Exact date – baseline data collection:
• August-September 2020: design of the evaluation
• September-October 2020: promotion of the courses between potential eligible candidates
• September-October 2020: checking for candidates’ eligibility and registering consent, running the baseline survey and assigning the selected candidates to the treatment and control groups.
• November 2020: running the market study survey to contribute to a better understanding of local markets, including internship and job opportunities.
Approximate date – start of intervention:
• November-December 2020 (exact date): those participants selected to the vocational training receive 160 hours vocational training at the CIFAP of Bula.
• January-March 2020: participants undertake either a traineeship in a local firm located in Cacheu or Oio or an entrepreneurship support program.
• November 2020 -September 2021: the beneficiaries of the scholarships attend a vocational training course in a centre of their choice within Guinea-Bissau.
Approximate date – follow-up data collection:
• January-March 2022: running the end-line survey
C) Application mechanism
1. Sampling: the sample was obtained through a promotional campaign on the national radio and Facebook.
2. Shortlisting and screening: interested candidates called our team, being screening for eligibility. Those fulfilling the eligibility criteria were included in the randomization. The individuals in the treatment group were invited to take an examination in person. The day of the examination the fulfilment of the mentioned criteria was checked upon administrative documents and personal interviews.
3. Allocation to the courses: the matching between the available positions in each course was done balancing the performance of the test-takers and their preferences, as previously explained
D) Eligibility mechanism
1. Eligibility criteria:
The GOT programme targeted young people living in the regions of Cacheu and Oio who have some history or internal or international migration or consider the possibility of migrating in the future. The existence of the programme was advertised in the main municipalities in the regions of Cacheu and Oio, including a list of phone numbers to which those interested could call and apply.
Hence, only men satisfying these conditions were considered eligible to take part in the project for the sake of the present impact evaluation. We considered only candidates answering positively the following questions:
- Willingness to take part in at least one of the offered courses, travelling to the municipality where the vocational training takes place for the duration of the courses.
• Region of residence: the experiment was run only in the regions of Cacheu and Oio since it aims to isolate the impact of vocational training in rural areas. Only candidates that had their residence in one out of the two regions passed to the next phase of the interview. In order to control for the truthfulness of statements in the baseline survey, potential participants were asked to bring an official identity document the examination day and their region of residence was checked.
• Migratory profile: the effective implementation of this criteria was done through the establishment of three questions directed to identify the three relevant types of migrants: internal, returned, and potential migrants. Only men who could be identified at least as one of these types of migrants were considered eligible. From our experience with previous surveys, we know we can trust people’s word on this and, moreover, since the candidates did not know that there selection was conditional on having a migratory profile they are not expected to lie about it.
• Age: only individuals ranging between 18 and 34 years old were considered eligible to participate in the courses. This criterion was set after consultation with local consultants and ENGIM, aiming to address one of the main problems of the labour market in Guinea-Bissau: the lack of opportunities and high unemployment levels among young people. In order to control for the truthfulness of the age declared in the baseline survey, potential participants were asked to bring an official identity document the examination day and their age was checked.
• Other situations of vulnerability: given the large list of vulnerabilities among the target population and the subjectivity that would be required to rank people based on the different types of vulnerabilities, it was decided to proxy the multi-dimensional nature of vulnerability using per capita household income. Despite its limitations, this simple measure of poverty is widely recognised as a useful proxy for vulnerability by international organizations and development experts. The threshold was set at 25,000 FCFA/month per person, after consulting with local experts in the matter. This threshold was calculated through two question which ask potential candidates how many members were in their households and their approximate monthly household income. Follow up, consistency questions and embedded controls were included in the survey instrument to identify and exclude the individual that were providing unreliable answer. Moreover, the fact that potential candidates did not know the set threshold for participation or that participation was conditional on income should reduce their incentives to lie.
If these conditions were met, the enumerator will explain the candidate the basic elements of the vocational training program and asked If the candidate agrees to participate. Those who consented would then complete a baseline survey.
E) Allocation to treatment among the treated
Out of the 151 male candidates with no disability that were invited to take the examination, 56 were finally selected to participate in the vocational training courses at the CIFAP in Bula and 35 were given a grant to choose a training institution, for a total of 91 participants allocated to the treatment. The allocation to treatment was done according to the following procedure. First, the allocation was done trying to match the available courses and the candidates’ preferences. Among the people having one course as their first choice, the women got a spot with preference to men. If there were more women willing to do a course as first option than available spots, the available spots were allocated to them having into account their grades. If after the female allocation, there were free spots for a course those were distributed among the men with the best grades who had it as their first option. Such process repeated for people having the course as second option, third and so on until all spots were covered.
Afterwards, the scholarships were allocated to the people who did not get a spot in the vocational courses at Bula because of the lack of matching between their preferences and the course offer, but who still had a good performance at the exam. Thus, the scholarship was granted following the ranking of the candidates according to their grades, without taking in consideration their gender. In the cases where a candidate refused the offer, it went to the next one in the list. This process has resulted in 35 men getting a scholarship.
Summing up:
- Allocated to the treated group: 151.
- Allocated to treatment: 91.
o Allocated to courses in Bula: 56.
 Going to an entrepreneurship training: depending on the results of the courses
 Going to an internship: depending on the results of the courses
o Given a grant and freedom to choose training institution: 35.
Experimental Design Details
Randomization Method
Randomization done in office by a computer using STATA.
With individuals as the unit of observation, the randomization was done in three stages, following the next steps:
1. The individuals willing to participate in the vocational training filled in a phone baseline survey. Out of the 302 who passed the exclusion criteria and fulfilled the eligibility criteria, 151 were randomly selected to take an examination using the following STATA algorithm:

* Set the environment to make randomization replicable
isid interview__key, sort // [SORTS UNIQUE ID]

* Assign random numbers to the observations and rank them from the smallest to the largest
gen random_number = uniform() // [GENERATES A RANDOM NUMBER BETWEEN 0 AND 1]
egen ordering = rank(random_number) // [ORDERS EACH OBSERVATION FROM SMALLEST TO LARGEST]
* Assign observations to control & treatment group based on their ranks
gen group = .
replace group = 1 if ordering <= 151 // [ASSIGNS TREATMENT STATUS TO FIRST HALF OF SAMPLE]
replace group = 0 if ordering > 151 // [ASSIGNS CONTROL STATUS TO SECOND HALF OF SAMPLE]
Randomization Unit
Was the treatment clustered?

Experiment Characteristics

Sample size: planned number of clusters
Sample size: planned number of observations
302 individuals
Sample size (or number of clusters) by treatment arms
151 individuals allocated to the control group. 151 individuals allocated to the treated group out of which 91 were allocated to treatment. Among those allocated to treatment 56 individuals took a 160 hours vocational training at the CIFAP of Bula and 35 individuals received a scholarship to attend a vocational training in other centre within the country.
Minimum detectable effect size for main outcomes (accounting for sample design and clustering)
The minimum detectable effect size has been estimated for personal income, probability of active employment status and willingness to migrate. All estimations are based on -balanced- sample data of the control and treatment group, at baseline, setting the significance level of Type I errors to 0.05 and the probability of avoiding Type II errors, or power, to 0.80. MDES are calculated for the whole 151 individuals included in the treatment group, although only 91 of them were finally allocated to treatment. The mean personal income at baseline is 13,497 XOF, with standard deviation of 22,518 XOF for the control group and 20,853 XOF for the treatment one. The estimated minimum detectable effect size equals 7,058.3 XOF using a two-sided test. In other words, after the intervention the difference in average income across groups should be over 7,058.3 XOF or, more precisely, 52.3% of the average income for the control group to be detected. The mean willingness to emigrate equals 0.2605 with standard deviation of 0.2826 for the control group, while the standard deviation of the treated group is 0.3130. The estimated minimum detectable effect size equals 0.0965 using a two-sided test. In other words, after the intervention the difference in the willingness to emigrate index across groups should be over 0.0965 or, more precisely, 37% of the average willingness to emigrate index for the control group to be detected. Finally, the mean of the control group probability of active employment status equals to 23.84% and the standard deviation is 42.75% for both groups. The estimated minimum detectable effect size equals 13.83% using a two-sided test. In other words, after the intervention the difference in the probability of having an active employment status across groups should be over 13.83 percentage points or, more precisely, 58% of the average probability for the control group to be detected.

Institutional Review Boards (IRBs)

IRB Name
Scientific Council of Nova School of Business and Economics
IRB Approval Date
IRB Approval Number


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