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University students' smartphone use has recently been shown to negatively affect their academic performance. Surprisingly, research testing the empirical validity of potential mechanisms underlying this relationship is very limited. In particular, indirect effects of negative health consequences due to heavy smartphone use have never been investigated. To fill this gap, we investigate, for the first time, whether deteriorated sleep quality drives the negative impact on academic performance. To this end, we examine longitudinal data on 1,635 students at two major Belgian universities. Based on a combination of a random effects approach and seemingly unrelated regression, we find no statistically significant mediating effect of sleep quality in the relationship between smartphone use and academic performance.

This article contributes to the nascent literature on the effect of grade retention in school on later labour market success. A field experiment is conducted to rule out the endogeneity of both outcomes. More concretely, various treatments of grade retention are randomly assigned to fictitious résumés sent in application to real vacancies. Overall, grade retention does not significantly affect positive call-back by employers. However, when narrowing in on vacancies for occupations where on-the-job training is important, job candidates with a record of grade retention are 16% less likely to receive a positive reaction. This finding is consistent with Queuing theory.

We investigate whether relative age (i.e. the age gap between classmates) affects life satisfaction and health in adolescence. We analyse data on students between 10 and 17 years of age from the international survey 'Health Behaviour in School-Aged Children' and find robust evidence that a twelve-month increase in relative age (i.e. the hypothetical maximum age gap between classmates) i) increases life satisfaction by 0.168 standard deviations, ii) increases selfrated general health by 0.108 standard deviations, iii) decreases psychosomatic complaints by 0.072 standard deviations, and iv) decreases chances of being overweight by 2.4%. These effects are comparable in size to the effects of students' household socio-economic status. Finally, gaps in life satisfaction are the only ones to reduce with the increase in absolute age, but only in countries where the first tracking of students occurs at 14 years of age or later.

Internships during tertiary education have become substantially more common over the past decades in many industrialised countries. This study examines the impact of a voluntary intra-curricular internship experience during university studies on the probability of being invited to a job interview. To estimate a causal relationship, we conducted a randomised field experiment in which we sent 1,248 fictitious, but realistic, resumes to real job openings. We find that applicants with internship experience have, on average, a 12.6% higher probability of being invited to a job interview.

The literature on workplace learning in secondary education has mainly focussed on vocational education programmes. In this study, we examine the impact of internship experience in secondary education on a student's schooling and early labour market outcomes, by analysing unique, longitudinal data from Belgium. To control for unobserved heterogeneity, we model sequential outcomes by means of a dynamic discrete choice model. In line with the literature on vocational education programmes, we find that internship experience has a positive effect on labour market outcomes that diminishes over time, although within the time window of our study, we find no evidence for a null or negative effect over time.

We present the first systematic review of the scientific literature on smartphone use and academic success. We synthesise the theoretical mechanisms, empirical approaches, and empirical findings described in the multidisciplinary literature to date. Our analysis of the literature reveals a predominance of empirical results supporting a negative association between students’ frequency of smartphone use and their academic success. However, the strength of this association is heterogeneous by (a) the method of data gathering, (b) the measures of academic performance used in the analysis, and (c) the measures of smartphone use adopted. The main limitation identified in the literature is that the reported associations cannot be given a causal interpretation. Based on the reviewed findings and limitations, directions for further research are discussed.

After a decade of correlational research, this study attempts to measure the causal impact of (general) smartphone use on educational performance. To this end, we merge survey data on general smartphone use, exogenous predictors of this use, and other drivers of academic success with the exam scores of first-year students at two Belgian universities. The resulting data are analysed with instrumental variable estimation techniques. A one-standard-deviation increase in daily smartphone use yields a decrease in average exam scores of about one point (out of 20). When relying on ordinary least squares estimations, the magnitude of this effect is substantially underestimated. The negative association between smartphone use and exam results is more outspoken for students (i) with highly educated fathers, (ii) with divorced parents and (iii) who are in good health. Policy-makers should at least invest in information and awareness campaigns of teachers and parents to highlight this trade-off between smartphone use and academic performance.

This is the first study to investigate whether age gaps between classmates (that is, relative age) affect life-satisfaction gaps in adolescence. To this end, we analyse data from the multi-country Health Behaviour in School-Aged Children (HBSC) survey. We find evidence that relative age negatively impacts adolescents’ life-satisfaction. A twelve-month age gap decreases life-satisfaction, rated on a 0-10 scale, by 0.3 points. This negative effect is consistent across countries. Finally, this negative effect does not decrease with the increase in absolute age.

This study examines the impact of enrolling into dual apprenticeship programs in secondary education on six early employment outcomes. Our contribution to the literature is threefold. First, we estimate – within the same, Belgian secondary education framework – the effects of two distinct types of dual programs that combine part-time school- or training centre-based instruction with an apprenticeship in a firm. Second, these effects are identified by estimating a dynamic model capturing subsequent educational and labour market outcomes to control for the dynamic selection of students into dual programs. Third, this approach enables us to distinguish between the programs' direct effects (conditional on educational achievement) and indirect effects (via educational achievement). We find evidence for short-term labour market advantages but only for the program with the most days of in-field training. With these findings we contribute to the international discussion on the optimal design of vocational programs.

We contribute to the literature on relative age effects on pupils' (non-cognitive) skills formation by studying students' social network. We investigate data on European adolescents from the Health Behaviour in School Aged Children survey and use an instrumental variables approach to account for endogeneity of relative age while controlling for confounders, namely absolute age, season-of-birth, and family socio-economic status. We find robust evidence that suggests the existence of a substitution effect: the youngest students within a class e-communicate more frequently than relatively older classmates but have fewer friends and meet with them less frequently.

This study examines the direct and indirect impact (via educational achievement) of student work during secondary education on later employment outcomes. To this end, we jointly model student work and later schooling and employment outcomes as a chain of discrete choices. To tackle their endogeneity, we correct for these outcomes' unobserved determinants. Using unique longitudinal Belgian data, we find that pupils who work during the summer holidays of secondary education are 15.3% more likely to have a job three months after leaving school. This premium to student work experience is higher when pupils also work during the academic year and diminishes for later employment outcomes. When decomposing this total effect, it turns out that the direct returns to student work overcompensate its non-positive indirect effect via tertiary education enrolment.

We review the theories put forward, methodological approaches used, and empirical conclusions found in the multidisciplinary literature on the relationship between student employment and educational outcomes. A systematic comparison of the empirical work yields new insights that go beyond the overall reported negative effect of more intensive working schemes and that are of high academic and policy relevance. One such insight uncovered by our review is that student employment seems to have a more adverse effect on educational choices and behaviour (study engagement and the decision to continue studying) than on educational performance (in particular, graduation).

We test the basic assumption underlying the job competition and crowding out hypothesis: that employers always prefer higher educated to lower educated individuals. To this end, we conduct a randomised field experiment in which duos of fictitious applications by bachelor and master graduates are sent to real vacancies requiring only a bachelor degree. Our design allows to look at whether employers' preferences for overqualified versus adequately qualified applicants depend on the demand and supply context, sectoral activity and type of organisation, and characteristics of the posted vacancy. For the overall sample, we find that master graduates are 19% more likely to be directly invited for a job interview. Nonetheless, we conclude that eventual crowding out of bachelor graduates as a consequence of this selection policy is unlikely to be large since the advantage for master graduates is particularly observed for jobs with high overall invitation rates.

A dynamic discrete choice model is set up to estimate the effects of grade retention in high school, both in the short-run (end-of-year evaluation) and in the long-run (drop-out and delay). In contrast to other evaluation approaches, this model captures essential treatment heterogeneity and controls for grade-varying unobservable determinants. In addition, forced track downgrading is considered as an alternative remedial measure. Our results indicate that grade retention has a neutral effect on academic achievement in the short-run. In the long-run, grade retention, just like forced downgrading, has adverse effects on schooling outcomes and, more so, for less able pupils.

We investigate the impact of student work experience on later hiring chances. To completely rule out potential endogeneity, we present a field experiment in which various forms of student work experience are randomly disclosed by more than 1000 fictitious graduates applying for jobs in Belgium. Theoretical mechanisms are investigated by estimating heterogeneous treatment effects by the relevance and timing of revealed student work experience. We find that neither form of student work experience enhances initial recruitment decisions. For a number of candidate subgroups (by education level and occupation type), even an adverse effect is found.

This study investigates whether the choice for a vocationally versus a generally oriented higher education program entails a trade-off between higher employment chances and better matches at the start of the career (when opting for a vocational orientation) and a lower risk of bad match persistence later on (when opting for a general orientation). We rely on detailed early career spell data of Flemish graduates and assess the vocational orientation of their program by means of the presence of curriculum-based work placement. We model the program choice (vocationally versus generally oriented), the transition to a good match and the preceding transition to a bad match simultaneously. To account for non-random selection into vocational programs and into bad matches, the Timing of Events method is combined with an exclusion restriction. After accounting for unobserved heterogeneity, we do not find any evidence for a trade-off early in the career. This result contributes to the debate about the efficiency of vocationalising tertiary education programs through the implementation of work placement.

This study investigates whether young unemployed graduates who accept a job below their level of education accelerate or delay the transition into a job that matches their level of education. We adopt the Timing of Events approach to identify this dynamic treatment effect using monthly calendar data from a representative sample of Flemish (Belgian) youth who started searching for a job right after leaving formal education. We find that overeducation is a trap. This trap is especially important early in the unemployment spell. Our results are robust across various specifications and for two overeducation measures.