“Running Lean” is a book written by Ash Maurya. It’s about starting a new business or introducing new products, especially if the person who wanted to start it doesn’t want to spend time and money to discover that there’s no new market for it. AdWords is Google’s main revenue generator which is a pay-per-click advertisement. A report will be generated by Google on how many clicks a search variable / genre collected. So by using pay-per-click you can determine which area of the market will be best suited for targeting, and if you do it smartly you can do these types of tests without spending too much money.
Read the full article here:
Running Lean With AdWords – Search Engine Watch