Abstraction and cognitive flexibility were assessed in 197 preschool children at 2, 3, 4, and 5 years of age using the Flexible Item Selection Task, a task adapted from the Visual-Verbal Test (Feldman & Drasgow, 1951). On this new inductive task, children were shown a set of 3 cards and required to select 2 cards that matched each other on 1 dimension (Selection 1) and then to select a different pair of cards that matched each other on another dimension (Selection 2). Thus, 1 of the 3 cards always had to be selected twice according to different dimensions. Two-year-olds failed to understand basic task requirements as assessed by a criterial measure. Three-year-olds did more poorly on Selection 1 than 4- and 5-year-olds (who performed near ceiling), suggesting that 3-year-olds had difficulty with the abstraction component of the task. Four-year-olds did worse than 5-year-olds on Selection 2, suggesting that they had difficulty with the cognitive flexibility component (i.e., difficulty selecting the same card on more than 1 dimension). Results are discussed in terms of the development of executive function.

Goldstein's (1985) concept of systemic violence has contributed substantially to criminological thought and research, but its power can be enhanced by connecting it to a broader typology of social life: the resource exchange—social control typology. That typology connects systemic violence logically with two important yet neglected forms of drug market behavior: peaceful resource exchange and peaceful social control. This article, which is based on 50 in‐depth interviews with individuals involved actively or recently in drug selling, describes the various forms of violent and nonviolent resource exchange and social control in illicit drug markets, stating them in quantitative terms that are conceptually distinct and empirically observable. We conclude by discussing 1) the implications of peaceful behavior for a fuller understanding of violence and 2) the relevance of the resource exchange‐social control typology to criminological theory and research.

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