As the polymer foam manufacturing industry world-wide is a small and relatively well -defined group of companies, it is highly unlikely that manufacturers have failed to learn something of the need for the phase-out of the use of ODSs. However, the environmental importance of this action and the pivotal role of manufacturers in Article 5 countries may only have been recognised recently. For companies seeking to phase-out their use of ODSs, access to information on alternative technology options is critical. It is for this reason that Sourcebooks such as this are required.