Agenda item 25: Economic development of under-developed countries (A/2172, chapter III, A/2192, A/C.2/L.155, A/C.2/L.190, A/C.2/L.191, A/C.2/L.192 and A/C.2/L.193) : (b) Methods to increase world productivity : report of the Economic and Social Council (A/2172).