Spanish version at: http://www.ifpri.org/spanish/2020/focus/focus04sp.htm Table of Contents: Overview, by John Pender and Peter Hazell; Technologies for the east African highlands, by Frank Place; Technologies for the tropical Andes, by Tom Walker, et al.; Technologies for the southeast Asian uplands, by Sushil Pandey; Returns to public investment: evidence from India and China, by Shenggen Fan and Peter Hazell; Development strategies for semiarid south Asia, by John Kerr; Development strategies for the east African highlands, by John Pender; Development strategies for west Africa, by Simeon Ehui, Samuel Benin and Dunstan Spencer; The role of agricultural science, by Shawki Barghouti and Peter Hazell