Logical appeals. Logical appeals are viewed as especially trustworthy: “The facts don’t lie,” some say. Of course, facts are not the only type of logical appeals, which also include firsthand evidence drawn from observations, interviews, surveys and questionnaires, experiments, and personal experience; and secondhand evidence drawn from authorities, the testimony of others, statistics, and other print and online sources. Critical readers need to examine logical appeals just as carefully as emotional and ethical ones. What is the source of the logical appeal—and is that source trustworthy? Are all terms defined clearly? Has the logical evidence presented been taken out of context, and if so, does that change its meaning?