"Beliefs and Decision Rules in Public Good Games" is a scholarly book that explores the beliefs and decision rules of participants in public goods games. It provides a comprehensive analysis of the experimental methods used to investigate this topic. The first part of the book introduces the subject and addresses methodological questions arising from the intersection of experimental economics and social psychology. The theoretical foundations are presented in Chapter 2, where psychological and economic concepts related to the beliefs and decision rules of players are introduced. Chapter 3 focuses on the fundamental experimental tools that will be used in the subsequent experiments to measure the social orientation and beliefs of participants. This book is a valuable resource for researchers and students interested in the intersection of economics and psychology and who wish to understand the dynamics of decision-making processes in social contexts.