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This chapter examines the case of threshold concepts, as an example of a theory being developed and applied within higher education research. It traces the origins and meaning of the term, reviews its application by higher education researchers and discusses the issues it raises and the critiques it has attracted. This case is of particular interest, as the idea of threshold concepts is little more than a decade old, yet in that time it has attracted considerable attention.

We investigate how household disadvantage affects the time use of 15–18 year olds using 2003–2006 data from the American Time Use Survey. Applying competing-risk hazard models, we distinguish between the incidence and duration of activities and incorporate the daily time constraint. We find that teens living in disadvantaged households spend less time in nonclassroom educational activities than other teens. Girls spend some of this time in work activities, suggesting that they are taking on adult roles. However, we find more evidence of substitution into unsupervised activities, suggesting that it may be less-structured environments that reduce educational investment.