Ask clear questions. A critical thinker doesn't take everything at face value. She delves further into the situation or issue, looking for the underlying symptoms that caused the problem in the first place. By considering the true reason (or reasons) that underscore the question, a critical thinker has a better understanding of the argument and possible workable solutions.
Control emotion. As Mr. Spock used to say about rash or emotional decisions, "That's highly illogical." Critical thinkers employ logic and overlook strong emotions and biases. This way of thinking becomes necessary to weed out irrelevant details and focus just on the facts presented on both sides of an issue.
Identify the problem. A critical thinker defines what's wrong (the water pipes always burst in the morning, for example), then sets out to find possible reasons for this---and possible solutions.
Collect all the facts. Find reliable sources through news reports, books, magazines and experts until you have enough evidence to support your argument. Look for information in the most appropriate places instead of the most expedient.
Interpret the information in the right context. A critical thinker focuses on using the facts to answer the question clearly, and avoids bending them to make a presupposed point. Assess the gathered information with integrity and accept the conclusion. A critical thinker knows that he may discover new facts to supplant current conclusions. Answers are always subject to change if clearer information appears.
State your solution and facts to support them in order from the main arguments to the ancillary facts. Give the logical reasoning behind each supposition. Avoid "finger-pointing" or putting down opposing views.
Evaluate arguments that others make by identifying the claim, or supposition, and the supporting facts. Summarize the opinion first, then analyze and contrast it with your own beliefs and research. Once you've done this, you may enter into a dialogue with another critical thinker.