There is a book entitled Toilet Training in Less Than a Day, by Nathan H. Azrin and Richard M. Foxx.

What considerations would you make before beginning a toilet training effort of any kind, and what particular considerations would you make when considering Azrin and Foxx’s quick way (which is actually a culmination of several weeks of building up to the half day). 

Find a web site that suggests a particular approach or makes suggestions and summarize.

Then find some research support for any particular method or approach to toilet training that YOU would expound?