Let's say your topic is retail management for college grads. Can you imagine how many sources discuss retail management for college grads? Tons... and that's a bad thing! You couldn't get by with just pulling the top 10 sources, either. You'd find your sources would be on all different aspects of retail management for college graduates.

In other words, your research wouldn't have any focus. You need to narrow your topic. One way to narrow your topic is to ask a question BEFORE YOU BEGIN RESEARCHING such as: How does a college education affect a retail manager's salary? You wouldn't have as much sorting to do. You'd only have to look for sources that answered your question.