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Decision making is said to be a psychological construct. This means that although we can never "see" a decision, we can infer from observable behaviour that a decision has been made. Therefore we conclude that a psychological event that we call "decision making" has occurred. It is a construction that imputes commitment to action. That is, based on observable actions, we assume that people have made a commitment to effect the action.

Decision making is an important part of many professions, where specialists apply their expertise in a given area to making informed decisions. For example, medical decision making often involves making a diagnosis and selecting an appropriate treatment.

Due to the large number of considerations involved in many decisions, decision support systems have been developed to assist decision makers in considering the implications of various courses of action. They can help reduce the risk of errors.

1 Decision making style

According to Myers (1962), a person's decision making process depends to a significant degree on their cognitive style. Starting from the work of Carl Jung, Myers developed a set of four bi-polar dimensions. The terminal points on these dimensions are: thinking and feeling; extraversion and introversion; judgement and perception; and sensing and intuition. He claimed that a person's decision making style is based largely on how they score on these four dimensions. For example, someone that scored near the thinking, extroversion, sensing, and judgement ends of the dimensions would tend to have a logical, analytical, objective, critical, and empirical decision making style.

2 Cognitive and personal biases in decision making

It is generally agreed that biases can creep into our decision making processes, calling into question the correctness of a decision. Below is a list of some of the more common cognitive biases.

• Selective search for evidence - We tend to be willing to gather facts that support certain conclusions but disregard other facts that support different conclusions.
• Premature termination of search for evidence - We tend to accept the first alternative that looks like it might work.
• Conservatism and inertia - Unwillingness to change thought patterns that we have used in the past in the face of new circumstances. (See traditionA tradition is a story or a custom that is memorized and passed down from generation to generation, originally without the need for a writing system. Tools to aid this process include poetic devices such as rhyme and alliteration. The stories thus preserv.)
• Experiential limitations - Unwillingness or inability to look beyond the scope of our past experiences; rejection of the unfamiliar.
• Selective perception - We actively screen-out information that we do not think is saliant. (See prejudiceFor "with(out) prejudice" in law, see Prejudice (law). Prejudice is, as the name implies, the process of "pre-judging" something. In general, it implies coming to a judgement on the subject before learning where the preponderance of the evidence actually.)
• Wishful thinkingWishful thinking is the formation of beliefs and making decisions according to what might be pleasing to imagine instead of by appealing to evidence or rationality. Studies have consistently shown that, holding all else equal, subjects will predict positi or optimism - We tend to want to see things in a positive light and this can distort our perception and thinking.
• Recency - We tend to place more attention on more recent information and either ignore or forget more distant information. (See semantic priming .)
• Repetition bias - A willingness to believe what we have been told most often and by the greatest number of different of sources.
• Anchoring - Decisions are unduly influenced by initial information that shapes our view of subsequent information.
• Group think - Peer pressurePeer pressure comprises a set of group dynamics whereby a group in which one feels comfortable may override personal habits, individual moral inhibitions or idiosyncratic desires to impose a group norm of attitudes and/or behaviors. Popular usage associat to conform to the opinions held by the group.
• Source credibility bias - We reject something if we have a bias against the person, organization, or group to which the person belongs: We are inclined to accept a statement by someone we like. (See prejudiceFor "with(out) prejudice" in law, see Prejudice (law). Prejudice is, as the name implies, the process of "pre-judging" something. In general, it implies coming to a judgement on the subject before learning where the preponderance of the evidence actually.)
• Incremental decision making and escalating commitment - We look at a decision as a small step in a process and this tends to perpetuate a series of similar decisions. This can be contrasted with zero-based decision making. (See slippery slopeIn the contexts of debate or of rhetoric, the phrase slippery slope also appearing as the thin end of the wedge or the camel's nose refers both to an argument about the likelihood of one event given another, and to a fallacy about the inevitability of one.)
• Inconsistency - The unwillingness to apply the same decision criteria in similar situations.
• Attribution asymmetryAttribution theory is a field in social psychology, initiated by Fritz Heider in 1958, concerned with how people choose explanations for others' behavior. It explores how individuals "attribute" causes to events and how this cognitive perception affects t - We tend to attribute our success to our abilities and talents, but we attribute our failures to bad luck and external factors. We attribute other's success to good luck, and their failures to their mistakes.
• Role fulfillment - We conform to the decision making expectations that others have of someone in our position.
• Underestimating uncertainty and the illusion of control - We tend to underestimate future uncertainty because we tend to believe we have more control over events than we really do.
• Faulty generalizations - In order to simplify an extremely complex world, we tend to group things and people. These simplifying generalizations can bias decision making processes.
• Ascription of causality - We tend to ascribe causation even when the evidence only suggests correlation. Just because birds fly to the equatorial regions when the trees lose their leaves, does not mean that the birds migrate because the trees lose their leaves.

For an explanation of the logical processes behind some of these biases, see logical fallacyA logical fallacy is an error in logical argument which is independent of the truth of the premises. It is a flaw in the structure of an argument as opposed to an error in its premises. When there is a fallacy in an argument it is said to be invalid..