Guerrilla Testing: Quick Validation at Low Cost
Guerrilla testing is one of the most effective and simplest (cheapest too) form of user testing to improve the quality of your product, and make sure people can use it for its intended purpose. Using guerrilla testing usually means going into a public place (e.g. a coffee shop, train station, etc.) where you can find a relevant audience to validate critical ideas or assumptions about your product.