The Multiplication tool is one of the five powerful thinking tools taught to me by the folks at Systematic Inventive Thinking. I like this tool because it is simple and yields great results. Even children can learn it.
Multiplication works by taking a component of the product, service, strategy, etc, and then making one or several copies of it. But the copy must be changed in some way from the original component. The original component is still intact, unchanged. Now using Function Follows Form, we work backwards to take this hypothetical solution and find a problem that it solves.