Abstract
This chapter reflects on the challenges of promoting corporate environmental and social responsibility among tour operators, through the efforts made by the Our Operators' Initiative for Sustainable Tourism Development (TOI), a network of tour operators who seek to improve their environmental performance and to incorporate sustainable development principles in their business operations. The chapter focuses on the range of indicators decided upon by the TOI, presented under 5 areas of management: product management and development, internal management, supply chain management, customer relations, and cooperation with destinations.