These are some of the tools (flowcharts, paper prototypes and personas) I have used during the design process to understand better the project boundaries and the implications on end-users, scenarios and system workflow.

tools-01tools-01
tools-02tools-02
tools-03tools-03
tools-04tools-04
tools-05tools-05
tools-06tools-06
tools-07tools-07
tools-08tools-08