This document is a toolkit for overseeing intelligence services published by DCAF, an international foundation dedicated to security sector governance. It contains seven tools that provide guidance on establishing effective intelligence oversight systems. The tools cover topics such as introducing intelligence oversight, establishing oversight systems, balancing transparency and secrecy, conducting oversight activities, overseeing information collection, use of personal data, and information sharing. The overall aim of the toolkit is to help states develop robust yet practical oversight of their intelligence services in accordance with democratic principles and human rights.