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In an era of increased autonomy and accountability in education, school principals have been given the responsibility for many tasks that used to be centralized, such as hiring and managing personnel, ensuring that the curriculum is followed and that the development of the school is on the right path. In this study an exploration is attempted into the associations among institutional context, school leadership, school climate and student outcomes.

The authors analyze data from the Programme of International Student Assessment study 2015 to identify variations in institutional context (autonomy and accountability) among education systems to determine whether and how institutional context is associated with leadership and whether education systems, in turn, are associated with school climate and students' achievement in reading. To account for the hierarchical structure of the education systems under investigation, a three-level structural equation modeling (SEM) approach was employed to analyze the data gathered on the institutions, schools and students.

No association was found between the degree of autonomy of an education system and leadership behavior; however, accountability and leadership seemed to go together. Achievement in reading competencies was greater in school systems in which principals had more autonomy. At the school level, a relationship was found between leadership and opportunities for parental involvement.

The results of this study indicate the need of strong leadership in order to have better results when there is more accountability. In this sense, the authors' findings also point to the increased importance of context-sensitive leadership skills.

The purpose of this paper is to investigate the potential effects of the so-called sharing economy on growing city tourism as well as on urban property markets.

Official statistical data and a geo-information system (GIS) are used on a small scale in order to identify concentration processes among overnight visitors and the potential concomitant conflicts with other interest groups.

Currently, the effects of the sharing economy on housing markets and city tourism are barely measurable and are limited to a few central locations. However, a growing demand can be discerned in housing-like accommodation concepts which can be operated via booking platforms. As there is likely to be strong future growth in this area, continuous market observation (monitoring) is urgently advised.

Official statistics only allow an analysis of overnight guests staying with larger accommodation providers. Booking platforms for holiday homes and other temporary accommodation options have such little interest in data transparency that the overall phenomenon of city tourism can be addressed only in part.

Associating various data within the GIS enables municipal administrators and urban planners to identify potential sources of conflict within the property markets in good time and effectively counteract these where possible.

Increases in property prices directly attributable to growing city tourism may lead to the displacement of less financially secure members of the established population as well as businesses.

The sharing economy is a relatively new research topic which will become increasingly important in future. The identification of potential sources of conflict due to tourist accommodation has therefore not yet been comprehensively carried out on a small scale.