Brainstorm about your topic. Write down what you know about the topic and questions you have about it. You can use concept maps to help you and to generate keywords you can use in your search.
Remember to think about synonyms too. For example, "global warming" and "climate change" are both useful search terms for that topic.
Search using the most obvious terms. Use some of the keywords from your brainstorming. This is the easiest step.
Re-search is when you use search strategies to get more, fewer or more relevant results.
Too many results? Try using AND, subject headings or phrase searching
Too few results? Try using OR, synonyms, related words or truncation
Tip: Use the first good article you find to help you find better ones. It can give you some new search terms to try and subject headings.
Evaluate your information using the CRAAP test. Based on what you discover, go back and brainstorm and re-search some more.