Sentence:  A massive investigation of the characteristics of in-migrants and prospective out-migrants in Ruanda-Urundi is being <WSD>carried</WSD> on by J. J. Maquet , former Director of the Social Science branch of IRSAC , now a professor at l ' Universite Officielle du Congo Belge et du Ruanda-Urundi . 
Meaning of the word marked with <WSD> tags:  direct the course of; manage or control