Beginners:

     Basic 72 hour PDC

     Fundamentals + Practicum (~8 days each)

by location

     URBAN

by climate

     Arid/Drylands

     Tropical

     Maritime

by economics

     Third World

by topic

     Water

     Keyline

     Natural Building

by experience

     Advanced

     Teacher Training

by purpose

     Practicum (2nd half of 72 hr certificate PDC)

          (to work on a specific project)

     Ecovillage Development

     Teacher Training

by schedule

     Apprenticeship

     Residential

     Weekend

     Alternate Weekend

     Semester

     Residential Internship

     Adventure Tour

Additions welcome....