Why does it matter whether or not you know what type of source you need? Can’t you just type your query into Google and look at the first few results? Sometimes, a basic web search will lead you to a source you can feel comfortable using for your academic work, and sometimes it won’t. If you know upfront when you need to look elsewhere, you can save yourself some time and conduct a more efficient search. Purpose-Process-Product gives you a framework to understand the different uses of different types of information resources, so you can be confident you’re choosing the right source for your information need.