If one thing is useful, then it will be used. The main problem is you can say that only after this thing is done. The way i work with my customers is using a mo

If one thing is useful, then it will be used. The main problem is you can say that only after this thing is done. The way i work with my customers is using a mockup. A graphical interface that simulates interaction and use case. Explain your ideas creating a context, an environment (mobile o pc) and satisfying one need at the time. You'll be successful on defining what is useful or not. You can use Balsamiq as tool.