course paper about PEAR - help

Dear Sir or Madame, I have written you - I am a studen from Latvian University who is writing a course paper about PEAR. And now I have a few more questions: 1) have you any ither presentations ( graphs or other types) about different dependence of PEAR classes (global (between big classes) and local (for each big PEAR class). 2) is PEAR project growing (number of people who works on the project) and why there is so less documentation even on a most used classes 3) why is it better to use installation instead of simple uncompressing package to the needed directory Thank you in advance, Sincerely Yours, Karlis Veshters