The "voltage effect" is defined as the tendency for a program's efficacy to change when it is scaled up, which in most cases results in the absolute size of a program's treatment effects to diminish when the program is scaled. Understanding the scaling problem and taking steps to diminish...

Der Autor, ein US-Journalist, belegt akribisch die Fortschritte der Welt auf vielen Gebieten, zeigt, wo noch besondere Anstrengungen nötig seien (beim Klima und der Ungleichheit) und plädiert insgesamt für mehr Optimismus. (2)

"This book argues that Nigeria's economic growth from 2001-2011 was fostered by improved governance, and it examines the perceived rivalry between China and the United States as well as how their foreign policies influenced decisions on foreign aid and trade in Nigeria."

The concept of "public accountability" is a challenge for political science as a new concept in this area in full debate and developement ,both in theory and practice. This paper is a theoretical approach of displaying some definitions, relevant meanings and significance odf the concept in...