“…An alternative skillsbuilding model claims that being involved in paid work builds skills and attitudes that are important for a reliable worker (Mortimer and Finch 1986;Schoenhals et al 1998). A combination of the school/work competition and the skills-building model is what some refer to as a threshold model (Greenberger and Steinberg 1986;Marsh and Kleitman 2005), according to which work is conducive to education and development in the lower range of hours invested, but detrimental at more than 20 h of work per week. Looking back over three decades of empirical work and drawing on more recent analyses of large-scale longitudinal data sets (NELS), Marsh and Kleitman (2005) conclude: First, paid employment during high school has negative effects on a wide range of desirable outcomes (achievement, course work selection, educational and occupational aspirations and college attendance, staying out of trouble, developing positive habits); second, these negative effects are present even at lower levels of employment (less than 10 h a week); and third, negative effects become more pronounced as the number of hours at work increases, following a linear relationship, except among those students who work to save money for college.…”