Working in Waves is quite an interesting approach. Although it is best suited for young founders with little responsibilities who can do contract jobs.
Another option is the "Nights and Weekends" option best suited for those who have full time jobs.
Another option is the "Nights and Weekends" option best suited for those who have full time jobs.
A project which would normally be released in two months can take a year or so - I can't really imagine doing business this way.