Sample proposals web designers can use.

The web is a powerful force. The web is the future. We, web designers see this and fully understand the potential of what a website can do for an organisation. The question is how do we convice companies that a website will make a difference to their business. Is there any marketing methods. Proposal writing perhaps? We would like to learn and perfect the methods here. Anybody out there with a sample outline which we can use as a proposal?