V-Model
http://www.continental-corporation.com/www/download/hr_ro_ro/themes/events/hidden/downloads/V-Model.pdf

http://istqbexamcertification.com/what-is-v-model-advantages-disadvantages-and-when-to-use-it/

http://en.wikipedia.org/wiki/V_model
http://en.wikipedia.org/wiki/V-Model_(software_development)

State machine
http://en.wikipedia.org/wiki/State_machine

Sequence Diagram
http://en.wikipedia.org/wiki/Sequence_diagram

Model - View - Controller
http://en.wikipedia.org/wiki/Model_view_controller