In each category, several questions are asked. Do I have to answer all the questions?

Yes. You must answer all questions and keep track of the word count limit. It is important to mention specific examples, highlighting the results that have been achieved, figures, indicators and the potential impact of the research proposal.  

Do I need both letters of recommendation, or may I present just one, or even more than two?

Yes, you must present both letters of recommendation for the application to be complete and considered by the jury. More than two letters per candidacy will not be accepted.
Derechos Reservados. 2017.
Banco Interamericano de Desarrollo.