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This study examines the effects of different types of private Islamic schools on student achievement and achievement gaps. We formulate hypotheses, drawing on an education production function approach that outlines differences in investment and resource allocation decisions across these tracks and streams. We tested our hypotheses using Indonesian data collected in 2013 on 156,952 students nested in 3,150 schools in 366 municipalities. Using multilevel regression analyses, we found that student achievement and achievement gaps vary over private Islamic school tracks and streams. Even though student achievement and achievement gaps are strongly determined by student and family characteristics, our findings suggest that differences between school tracks and streams also play an important role. Moreover, our study revealed a large variability in student achievement and achievement gaps between municipalities.

'Representative voice' can be defined as actions in which one or more speakers represent others when speaking up about a problem at the workplace or making a suggestion. The purpose of this paper is to introduce the concept of representative voice, assess the frequency of its occurrence and examine department characteristics associated with its frequency. We present a theoretical framework and develop and test hypotheses about the effects of characteristics of the departmental context on the frequency of representative voice. Our focus is on organizational design features, i.e. characteristics that can be directly implemented by management. Data on 40 departments of a large Dutch childcare organization suggested that representative voice occurred in most of the organization's departments, although not frequently. Multilevel analyses showed that representative voice was best predicted by the presence of shared problems. Further, representative voice was more frequent in departments in which employees worked directly with clients (i.e. children), and in larger departments. Frequent contact with the department's manager and among the department's employees had no effect.

Dynamic network models based on the homophily principle are criticized for neglecting organizational context conditions and the impact of role structures on the evolution of intra-organizational trust networks. Using a neo-institutional framework it is argued that individuals in competitive environments will attempt to reduce uncertainty about the trustworthiness of potential trustees by imitating the sociometric choice behavior of persons in similar network positions. Three hypotheses are developed. The positional trust hypothesis predicts that individuals tend to trust other actors who occupy a similar network position as themselves. The mimetic trust hypothesis argues that individuals trust actors who are trusted by persons in their own network position. Finally, the advisory trust hypothesis claims that individuals prefer to maintain trust relations to persons occupying a position of third party intermediary than to persons in other positions. An exploratory empirical test of the hypotheses is carried out by reanalyzing a longitudinal network study of the relationships among 25 salesmen in the furniture department of a North American retail sales store during the 1950s. Blockmodelling procedures are used to identify structural positions in the networks, and log-linear analysis is applied to determine stability of choices within and between structural positions. The results support the mimetic trust and the advisory trust hypothesis.