Migration thus raises sensitive and highly charged issues in most countries. The international development agenda, as already noted, has included aid, investment, trade preferences and technology—all essentially aimed at removing obstacles to the international movement of various factors of production. Yet, the international mobility of labour has largely been ignored, while it should occupy a prominent position in the international development framework. Measures should be taken to link migratory flows to the creation and diffusion of global knowledge, both codified and tacit. Baltimore, The Johns Hopkins University Press, 2011).