As you begin reading the sources you have chosen, keep an open mind. Do not let your personal beliefs prevent you from listening to new ideas and opposing viewpoints. Be curious about the wide range of positions in the research conversation you are entering. Your research question should guide you as you engage your sources.

When you read critically, you are not necessarily judging an author’s work harshly; you are simply examining its assumptions, assessing its evidence, and weighing its conclusions.

Reading critically means

To see one student’s careful reading of a source text, see 5a. See the checklist at the bottom of this page for help in evaluating sources.

using sources responsibly: Take time to read the entire source, if possible, to understand an author’s arguments, assumptions, and conclusions. Try to avoid taking quotations from the first few pages of a source before you understand if the words and ideas are representative of the work as a whole.

Distinguishing between primary and secondary sources

As you begin assessing evidence in a source, determine whether you are reading a primary or a secondary source. Primary sources include original documents such as letters, diaries, films, legislative bills, laboratory studies, field research reports, and eyewitness accounts. Secondary sources are commentaries on primary sources—another writer’s opinions about or interpretation of a primary source.

Although a primary source is not necessarily more reliable than a secondary source, it has the advantage of being a firsthand account. You can better evaluate what a secondary source says if you have first read any primary sources it discusses.

Being alert for signs of bias

Bias is a way of thinking, a tendency to be partial, that prevents people and publications from viewing a topic objectively. Both in print and online, some sources are more objective than others. If you are exploring the rights of organizations like WikiLeaks to distribute sensitive government documents over the Internet, for example, you may not find objective, unbiased information in a US State Department report. If you are researching timber harvesting practices, you are likely to encounter bias in publications sponsored by environmental groups. As you read sources, however, you need not reject those that are biased. Publications that are known to be reputable can be editorially biased. As a researcher, you will need to consider any suspected bias as you assess the source. If you are uncertain about a source’s special interests, seek the help of a reference librarian.

Like publishers, some authors are more objective than others. If you have reason to believe that a writer is particularly biased, you will want to assess his or her arguments with special care. For a list of questions worth asking, see the chart at the bottom of this page.

Assessing the author’s argument

In nearly all subjects worth writing about, there is some element of argument, so expect to encounter authors who disagree. In fact, areas of disagreement give you entry points in a research conversation. The questions in the chart in 6c can help you weigh the strengths and weaknesses of each author’s arguments.