The research articles in this volume cover timely quantitative psychology topics, including new methods in item response theory, computerized adaptive testing, cognitive diagnostic modeling, and psychological scaling. Topics within general quantitative methodology include structural equation modeling, factor analysis, causal modeling, mediation, missing data methods, and longitudinal data analysis. These methods will appeal, in particular, to researchers in the social sciences. The 80th annual meeting took place in Beijing, China, between the 12th and 16th of July, 2015. Previous volumes to showcase work from the Psychometric Society's Meeting are New Developments in Quantitative Psychology: Presentations from the 77th Annual Psychometric Society Meeting (Springer, 2013), Quantitative Psychology Research: The 78th Annual Meeting of the Psychometric Society (Springer, 2015), and Quantitative Psychology Research: The 79th Annual Meeting of the Psychometric Society, Wisconsin, USA, 2014 (Springer, 2015).

The 78th Annual International Meeting of the Psychometric Society (IMPS) built on the Psychometric Society's mission to share quantitative methods relevant to psychology. The chapters of this volume present cutting-edge work in the field. Topics include studies of item response theory, computerized adaptive testing, cognitive diagnostic modeling and psychological scaling. Additional psychometric topics relate to structural equation modeling, factor analysis, causal modeling, mediation, missing data methods and longitudinal data analysis, among others. The papers in this volume will be especially useful for researchers (graduate students and other quantitative researchers) in the social sciences who use quantitative methods, particularly psychologists. Prior knowledge of statistical methods is recommended for the best use of this volume. The conference took place in Arnhem, The Netherlands between July 22nd and 26th, 2013. This is the second volume to showcase the Psychometric Society Meeting. The first is New Developments in Quantitative Psychology: Presentations from the 77th Annual Psychometric Society Meeting (Springer, 2014).

This volume provides a succinct up-to-date summary of global research on principal instructional leadership as it has evolved over the past 50 years. The book's particular focus is on the development and use of the Principal Instructional Management Rating Scale (PIMRS). The PIMRS is the most widely used survey instrument designed for assessing instructional leadership for research and practice. It has been used in more than 250 studies in more than 30 countries around the world. The authors provide a detailed conceptual and data-based description of the rationale and development of the instrument as well as the ways in which it has been used in practice. The book also provides, for the first time, a comprehensive assessment of the scale's measurement properties. This represents essential information for future users of the instrument across different national contexts. Finally, the volume outlines an agenda for improving future research on the role of principal instructional leadership in student learning and school effectiveness.

The 78th Annual Meeting of the Psychometric Society (IMPS) builds on the Psychometric Society's mission to share quantitative methods relevant to psychology. The chapters of this volume present cutting-edge work in the field. Topics include studies of item response theory, computerized adaptive testing, cognitive diagnostic modeling, and psychological scaling. Additional psychometric topics relate to structural equation modeling, factor analysis, causal modeling, mediation, missing data methods, and longitudinal data analysis, among others. The papers in this volume will be especially useful for researchers in the social sciences who use quantitative methods. Prior knowledge of statistical methods is recommended. The 78th annual meeting took place in Arnhem, The Netherlands between July 22nd and 26th, 2013. The previous volume to showcase work from the Psychometric Society's Meeting is New Developments in Quantitative Psychology: Presentations from the 77th Annual Psychometric Society Meeting (Springer, 2014).

The research articles in this volume cover timely quantitative psychology topics, including new methods in item response theory, computerized adaptive testing, cognitive diagnostic modeling, and psychological scaling. Topics within general quantitative methodology include structural equation modeling, factor analysis, causal modeling, mediation, missing data methods, and longitudinal data analysis. These methods will appeal, in particular, to researchers in the social sciences. The 80th annual meeting took place in Beijing, China, between the 12th and 16th of July, 2015. Previous volumes to showcase work from the Psychometric Society's Meeting are New Developments in Quantitative Psychology: Presentations from the 77th Annual Psychometric Society Meeting (Springer, 2013), Quantitative Psychology Research: The 78th Annual Meeting of the Psychometric Society (Springer, 2015), and Quantitative Psychology Research: The 79th Annual Meeting of the Psychometric Society, Wisconsin, USA, 2014 (Springer, 2015).

This volume provides a succinct up-to-date summary of global research on principal instructional leadership as it has evolved over the past 50 years. The book’s particular focus is on the development and use of the Principal Instructional Management Rating Scale (PIMRS). The PIMRS is the most widely used survey instrument designed for assessing instructional leadership for research and practice. It has been used in more than 250 studies in more than 30 countries around the world. The authors provide a detailed conceptual and data-based description of the rationale and development of the instrument as well as the ways in which it has been used in practice. The book also provides, for the first time, a comprehensive assessment of the scale’s measurement properties. This represents essential information for future users of the instrument across different national contexts. Finally, the volume outlines an agenda for improving future research on the role of principal instructional leadership in student learning and school effectiveness.