Doing research on migration and development is tough. Some of the most basic questions can't even get off the whiteboard because data on migration are so limited. If the government of Kenya wants to know how many doctors went last year from Nairobi to London, or vice versa, no one can tell. If a hard-working economist wants to know how many Pakistanis have temporary labor contracts in the Gulf countries, good luck.
Migration is shaping global development, but much of it is inscrutable. Even legal movements occur in the shadows.