Conditional reasoning refers to both a general theory of personality and an indirect measurement system used to assess personality. The basic tenets of the conditional reasoning theory of personality include: a) individuals’ wish to maintain a self-perception that their behavior is reasonable, logical, rational, and appropriate (versus unreasonable, illogical, irrational, and inappropriate); b) individuals with a strong implicit motive (desire or need) to pursue a behavior will develop biased patterns of reasoning that facilitates the conclusion that their behavior was indeed reasonable (i.e., logical, rational, appropriate); c) biases that serve to enhance the logical appeal of motive-based behaviors may be referred to as “justification mechanisms”; and d) distinct clusters or sets of justification mechanisms will be associated with each implicit motive. The basic tenets of the conditional reasoning measurement system include: a) it is possible to measure the extent to which justification mechanisms influence (i.e., bias) reasoning by asking individuals to solve inductive reasoning problems; b) individuals with stronger levels of the implicit motive (e.g., motive to aggress) will be more likely to select solutions to reasoning problems that are derived from the motive-relevant justification mechanisms (e.g., hostile attribution bias, retribution bias, derogation of target bias); and c) conditional reasoning is said to occur when the likelihood of judging a solution to an inductive reasoning problem as “correct” depends on the personality (i.e., the implicit motives and accompanying justification mechanisms) of the respondent.