I am not one to speak ill of any ideas often, BUT
one of the issues with choosing the type of instruction is simply a preconceived idea of the type of structure people want.
Then;
- site conditions w.r to the sun
- terrian
- climatic conditions of the area
- on site materials, suitable soil for
cob, mud bricks, stones, rocks or timber
- availability locally of materials
- availability of skills locally or yourself.
-
water supply. water is essential to have for earth building
- design of structure, sometimes the design excludes particular materials.
I always ask people to think about what style, type and size of house they have in mind.
Then encourage them to research in some way examples of what they have in mind, and others they may reject. This helps formulate some concepts.
Then think about how or whom is carrying out the major proportion of the work.
By then things seem to fall into place.