By the end of each course the students are asked the following question: "Let us suppose that you are in another country and you want to know the family or genus of, say, 100 trees. How many trees do you think you could identify down to family level ?". Some of the answers are: "... up to 80% " ", ... I feel that 100%..." (See "Instructors and Referencens".)

Concerning the teaching methodology, one university professor wrote: "... the unique teaching methodology which allows the student to identify 60-85% of specimens encountered to the family level with only vegetative characteristics. I never thought this possible but the system of organization, the gradual and repetitive manner in which it is implemented, and the development of a comprehensive key or Matrix make this level of accuracy possible." ... (This is part of full text letter by Professor Dr. Alan Bjorkman) (See also opinions about methology in the section Professors (Dendrology, Biology, Ecology) of "Instructors and References").

Concerning organization and logistics, some of the answers are:

"The course was well organized; everything was ordered. We passed in good hotels, and transport was efficient..." (Professor Vera Lex Engel, BRAZIL).

"... We get to know each other all very well, very quickly which I have found in my many years of teaching is a very important thing in a class, to have a camaraderie and a generally helpful environment." ..... "This course is best described as intensive, very constructive, its pedagogy is very fine tuned and Dr. Jimenez, the course manager, sticks to it very, very diligently".... (Professor Charles F. Quibell, USA)

"When I first arrived I thought there might be a lot of primitive camping involved and I've been happily surprised over the convenience lodging and the good meals that are always available. It's been very satisfactory and helps us in using all our energy in concentrating in the subject matter that we came down here to understand more fully" (Professor Duane Houck, USA).

"The course has definitively gone smoothly from start to finish...., excellent food, no snags in terms of waiting for transportation, or hotels or anything like that, it's gone 1,2,3 with a minimum of input from ourselves as to how get things done" (Entomologist Sacha Spector, USA).

Besides, university professors have sent us letters warmingly commenting the excellence of the course and have offered to provide further information on request. Some of these letters have been reproduced in full text.