This book is the product of an intensive cooperation between psych-
ogists and sociologists who study solidarity and prosocial behavior, and
its fruits are briefly summarized in Chapter 1. The topics of so- darity
and prosocial behavior are at the core of both disciplines and thus one
might expect that an intensive cooperation like the one that produced
this book is not uncommon. Surprisingly however, it is extremely rare
that sociologists and psychologists get together to c- bine their
knowledge in these fields. Instead, researchers from both disciplines
tend to ignore each other's work quite generally, and the work on
prosocial and antisocial behavior is no exception. The conviction that
sociology and psychology can benefit from each other's work led us--a
group of sociologists and psychologists at the University of Groningen
(The Netherlands)--in 1999 to launch a joint research project on
solidarity and prosociality. The aim was to find a common ground on
which insights from each discipline could contribute to a broader
understanding of solidarity and prosocial behavior. This
interdisciplinary research project was called Prosocial Dispositions and
Solidary Behavior and it was financed by the University of Groningen as
a so-called breedtestrategie program (i.e., a program for broadening
disciplinary approaches).