For the potential advantages of migration to be harnessed, it is crucial that immigration be accompanied by integration, or effective mechanisms for ensuring that immigrants are incorporated into labour markets, the economy and society. While immigration policy is often determined, designed and funded at the national level, its impact on migrants and society is more strongly felt at the local level where other policies interact. This publication highlights principles and factors which are important in supporting integration locally. A comparison of local initiatives implemented in five OECD countries - Canada, UK (London), Spain, Italy, and Switzerland - answers key questions facing all policy makers and stakeholders working in this field. This book provides a set of concrete policy recommendations for implementation at both local and national levels.