We suggest to a UI expert or project Managers to use click through sketches prototypes for their customers before use favourite tools. Because in this process customer will get confidence that they are working with the right organization and development team also will get an overview of the project and this will help them during the development.
There are lots of tools available - such as Balsamiq, Fireworks which builds wireframes and click dummies and this will helping to explain the targeted user experiences.
