 I probably would say the main challenge was that I came to the realization that for these kind of difficult environments breeding by itself may not be the answer, the only answer. Because a lot of the farmers were not using any inputs and so they were growing traditional varieties using no fertilizer and getting extremely low yields. The crop was highly variable. And so I really had a question about how much impact you can have just by coming up with the higher yielding variety. My initial emphasis was to try to get a stress-toner variety which has high yield characteristics like the semi-dwarfs that became popular during the Green Revolution. And I always had this question in my mind as to whether the farmers would really go for that considering that they had such poor management and such difficult environments, very poor soils, many constraints. So I think that was one of the challenges was how to deal with that problem, especially during a time when there wasn't really a focused program that dealt with the unfavorable environments that involved all the disciplines. It was basically I was working as a breeder without too much support by other scientists. Although there were physiologists working on stress tolerance and so forth. So that was a big challenge. And then the second challenge I think was later on when we started getting the new tools of genetics, molecular genetics, how to apply those tools in a practical way. I was one of the first people to work really in more in-depth on genetic mapping using molecular markers and I did a lot of work on that. I kept getting the question, okay, so how do you use that? What good is it to the breeders? And it was actually a bit difficult to answer that because we didn't have many good examples where that had paid off in breeding, especially in the early stages.