Cognitive process resulting in choosing a course of actions
Sample flowchart representing a decision process to add a new article to Wikipedia.
In psychology, decision-making (also spelled decision making and decisionmaking) is regarded as the cognitive process resulting in the selection of a belief or a course of action among several possible alternative options. It could be either rational or irrational. The decision-making process is a reasoning process based on assumptions of values, preferences and beliefs of the decision-maker. Every decision-making process produces a final choice, which may or may not prompt action.
Decision-making can be regarded as a problem-solving activity yielding a solution deemed to be optimal, or at least satisfactory. It is therefore a process which can be more or less rational or irrational and can be based on explicit or tacit knowledge and beliefs. Tacit knowledge is often used to fill the gaps in complex decision-making processes. Usually, both of these types of knowledge, tacit and explicit, are used together in the decision-making process.
Human performance has been the subject of active research from several perspectives:
Psychological: examining individual decisions in the context of a set of needs, preferences and values the individual has or seeks.
Cognitive: the decision-making process is regarded as a continuous process integrated in the interaction with the environment.
A major part of decision-making, involves the analysis of a finite set of alternatives described in terms of evaluative criteria. Then the task might be to rank these alternatives in terms of how attractive they are to the decision-maker(s) when all the criteria are considered simultaneously. Another task might be to find the best alternative or to determine the relative total priority of each alternative (for instance, if alternatives represent projects competing for funds) when all the criteria are considered simultaneously. Solving such problems is the focus of multiple-criteria decision analysis (MCDA). This area of decision-making, although very old, has attracted the interest of many researchers and practitioners and is still highly debated as there are many MCDA methods which may yield very different results when they are applied on exactly the same data. This leads to the formulation of a decision-making paradox. Logical decision-making is an important part of all science-based professions, where specialists apply their knowledge in a given area to make informed decisions. For example, medical decision-making often involves a diagnosis and the selection of appropriate treatment. But naturalistic decision-making research shows that in situations with higher time pressure, higher stakes, or increased ambiguities, experts may use intuitive decision-making rather than structured approaches. They may follow a recognition primed decision that fits their experience, and arrive at a course of action without weighing alternatives.
The decision-maker's environment can play a part in the decision-making process. For example, environmental complexity is a factor that influences cognitive function. A complex environment is an environment with a large number of different possible states which come and go over time. Studies done at the University of Colorado have shown that more complex environments correlate with higher cognitive function, which means that a decision can be influenced by the location. One experiment measured complexity in a room by the number of small objects and appliances present; a simple room had less of those things. Cognitive function was greatly affected by the higher measure of environmental complexity, making it easier to think about the situation and make a better decision.
It is important to differentiate between problem solving, or problem analysis, and decision-making. Problem solving is the process of investigating the given information and finding all possible solutions through invention or discovery. Traditionally, it is argued that problem solving is a step towards decision making, so that the information gathered in that process may be used towards decision-making.[page needed]
Characteristics of problem solving
Problems are merely deviations from performance standards.
Problems must be precisely identified and described
Problems are caused by a change from a distinctive feature
Something can always be used to distinguish between what has and hasn't been affected by a cause
Causes of problems can be deduced from relevant changes found in analyzing the problem
Most likely cause of a problem is the one that exactly explains all the facts, while having the fewest (or weakest) assumptions (Occam's razor).
Characteristics of decision-making
Objectives must first be established
Objectives must be classified and placed in order of importance
Alternative actions must be developed
The alternatives must be evaluated against all the objectives
The alternative that is able to achieve all the objectives is the tentative decision
The tentative decision is evaluated for more possible consequences
The decisive actions are taken, and additional actions are taken to prevent any adverse consequences from becoming problems and starting both systems (problem analysis and decision-making) all over again
There are steps that are generally followed that result in a decision model that can be used to determine an optimal production plan
In a situation featuring conflict, role-playing may be helpful for predicting decisions to be made by involved parties
When a group or individual is unable to make it through the problem-solving step on the way to making a decision, they could be experiencing analysis paralysis. Analysis paralysis is the state that a person enters where they are unable to make a decision, in effect paralyzing the outcome. Some of the main causes for analysis paralysis is the overwhelming flood of incoming data or the tendency to overanalyze the situation at hand. There are said to be three different types of analysis paralysis.
The first is analysis process paralysis. This type of paralysis is often spoken of as a cyclical process. One is unable to make a decision because they get stuck going over the information again and again for fear of making the wrong decision.
The second is decision precision paralysis. This paralysis is cyclical, just like the first one, but instead of going over the same information, the decision-maker will find new questions and information from their analysis and that will lead them to explore into further possibilities rather than making a decision.
The third is risk uncertainty paralysis. This paralysis occurs when the decision-maker wants to eliminate any uncertainty but the examination of provided information is unable to get rid of all uncertainty.
On the opposite side of analysis paralysis is the phenomenon called extinction by instinct. Extinction by instinct is the state that a person is in when they make careless decisions without detailed planning or thorough systematic processes. Extinction by instinct can possibly be fixed by implementing a structural system, like checks and balances into a group or one's life. Analysis paralysis is the exact opposite where a group's schedule could be saturated by too much of a structural checks and balance system.
Extinction by instinct in a group setting
Groupthink is another occurrence that falls under the idea of extinction by instinct. Groupthink is when members in a group become more involved in the “value of the group (and their being part of it) higher than anything else”; thus, creating a habit of making decisions quickly and unanimously. In other words, a group stuck in groupthink are participating in the phenomenon of extinction by instinct.
Information overload is "a gap between the volume of information and the tools we have to assimilate" it. Information used in decision making is to reduce or eliminate uncertainty. Excessive information affects problem processing and tasking, which affects decision-making. Psychologist George Armitage Miller suggests that humans’ decision making becomes inhibited because human brains can only hold a limited amount of information. Crystal C. Hall and colleagues described an "illusion of knowledge", which means that as individuals encounter too much knowledge it can interfere with their ability to make rational decisions. Other names for information overload are information anxiety, information explosion, infobesity, and infoxication.
Decision fatigue is when a sizable amount of decision-making leads to a decline in decision-making skills. People who make decisions in an extended period of time begin to lose mental energy needed to analyze all possible solutions. It is speculated that decision fatigue only happens to those who believe willpower has a limited capacity. Impulsive decision-making and decision avoidance are two possible paths that extend from decision fatigue. Impulse decisions are made more often when a person is tired of analysis situations or solutions; the solution they make is to act and not think.Decision avoidance is when a person evades the situation entirely by not ever making a decision. Decision avoidance is different from analysis paralysis because this sensation is about avoiding the situation entirely, while analysis paralysis is continually looking at the decisions to be made but still unable to make a choice.
A common laboratory paradigm for studying neural decision-making is the two-alternative forced choice task (2AFC), in which a subject has to choose between two alternatives within a certain time. A study of a two-alternative forced choice task involving rhesus monkeys found that neurons in the parietal cortex not only represent the formation of a decision but also signal the degree of certainty (or "confidence") associated with the decision. A 2012 study found that rats and humans can optimally accumulate incoming sensory evidence, to make statistically optimal decisions. Another study found that lesions to the ACC in the macaque resulted in impaired decision-making in the long run of reinforcement guided tasks suggesting that the ACC may be involved in evaluating past reinforcement information and guiding future action. It has recently been argued that the development of formal frameworks will allow neuroscientists to study richer and more naturalistic paradigms than simple 2AFC decision tasks; in particular, such decisions may involve planning and information search across temporally extended environments.
Emotion appears able to aid the decision-making process. Decision-making often occurs in the face of uncertainty about whether one's choices will lead to benefit or harm (see also Risk). The somatic marker hypothesis is a neurobiological theory of how decisions are made in the face of uncertain outcomes. This theory holds that such decisions are aided by emotions, in the form of bodily states, that are elicited during the deliberation of future consequences and that mark different options for behavior as being advantageous or disadvantageous. This process involves an interplay between neural systems that elicit emotional/bodily states and neural systems that map these emotional/bodily states. A recent lesion mapping study of 152 patients with focal brain lesions conducted by Aron K. Barbey and colleagues provided evidence to help discover the neural mechanisms of emotional intelligence.
Decision-making techniques can be separated into two broad categories: group decision-making techniques and individual decision-making techniques. Individual decision-making techniques can also often be applied by a group.
Consensus decision-making tries to avoid "winners" and "losers". Consensus requires that a majority approve a given course of action, but that the minority agree to go along with the course of action. In other words, if the minority opposes the course of action, consensus requires that the course of action be modified to remove objectionable features.
Quadratic voting allows participants to cast their preference and intensity of preference for each decision (as opposed to a simple for or against decision). As in score voting, it addresses issues of voting paradox and majority rule.
Delphi method is a structured communication technique for groups, originally developed for collaborative forecasting but has also been used for policy making.
Dotmocracy is a facilitation method that relies on the use of special forms called Dotmocracy. They are sheets that allows large groups to collectively brainstorm and recognize agreements on an unlimited number of ideas they have each wrote.
Satisficing: examining alternatives only until the first acceptable one is found. The opposite is maximizing or optimizing, in which many or all alternatives are examined in order to find the best option.
In the 1980s, psychologist Leon Mann and colleagues developed a decision-making process called GOFER, which they taught to adolescents, as summarized in the book Teaching Decision Making To Adolescents. The process was based on extensive earlier research conducted with psychologist Irving Janis. GOFER is an acronym for five decision-making steps:
Goals clarification: Survey values and objectives.
Options generation: Consider a wide range of alternative actions.
Facts-finding: Search for information.
Consideration of Effects: Weigh the positive and negative consequences of the options.
Review and implementation: Plan how to review the options and implement them.
In 2009, professor John Pijanowski described how the Arkansas Program, an ethics curriculum at the University of Arkansas, used eight stages of moral decision-making based on the work of James Rest:: 6
Establishing community: Create and nurture the relationships, norms, and procedures that will influence how problems are understood and communicated. This stage takes place prior to and during a moral dilemma.
Perception: Recognize that a problem exists.
Interpretation: Identify competing explanations for the problem, and evaluate the drivers behind those interpretations.
Judgment: Sift through various possible actions or responses and determine which is more justifiable.
Motivation: Examine the competing commitments which may distract from a more moral course of action and then prioritize and commit to moral values over other personal, institutional or social values.
Action: Follow through with action that supports the more justified decision.
There are four stages or phases that should be involved in all group decision-making:
Orientation. Members meet for the first time and start to get to know each other.
Conflict. Once group members become familiar with each other, disputes, little fights and arguments occur. Group members eventually work it out.
Emergence. The group begins to clear up vague opinions by talking about them.
Reinforcement. Members finally make a decision and provide justification for it.
It is said that establishing critical norms in a group improves the quality of decisions, while the majority of opinions (called consensus norms) do not.
Conflicts in socialization are divided in to functional and dysfunctional types. Functional conflicts are mostly the questioning the managers assumptions in their decision making and dysfunctional conflicts are like personal attacks and every action which decrease team effectiveness. Functional conflicts are the better ones to gain higher quality decision making caused by the increased team knowledge and shared understanding.
In economics, it is thought that if humans are rational and free to make their own decisions, then they would behave according to rational choice theory.: 368–370 Rational choice theory says that a person consistently makes choices that lead to the best situation for themselves, taking into account all available considerations including costs and benefits; the rationality of these considerations is from the point of view of the person themselves, so a decision is not irrational just because someone else finds it questionable.
In reality, however, there are some factors that affect decision-making abilities and cause people to make irrational decisions – for example, to make contradictory choices when faced with the same problem framed in two different ways (see also Allais paradox).
Rational decision making is a multi-step process for making choices between alternatives. The process of rational decision making favors logic, objectivity, and analysis over subjectivity and insight. Irrational decision is more counter to logic. The decisions are made in haste and outcomes are not considered.
One of the most prominent theories of decision making is subjective expected utility (SEU) theory, which describes the rational behavior of the decision maker. The decision maker assesses different alternatives by their utilities and the subjective probability of occurrence.
Rational decision-making is often grounded on experience and theories that are able to put this approach on solid mathematical grounds so that subjectivity is reduced to a minimum, see e.g. scenario optimization.
Rational decision is generally seen as the best or most
likely decision to achieve the set goals or outcome.
It has been found that, unlike adults, children are less likely to have research strategy behaviors. One such behavior is adaptive decision-making, which is described as funneling and then analyzing the more promising information provided if the number of options to choose from increases. Adaptive decision-making behavior is somewhat present for children, ages 11–12 and older, but decreases in presence the younger they are. The reason children aren't as fluid in their decision making is because they lack the ability to weigh the cost and effort needed to gather information in the decision-making process. Some possibilities that explain this inability are knowledge deficits and lack of utilization skills. Children lack the metacognitive knowledge necessary to know when to use any strategies they do possess to change their approach to decision-making.
When it comes to the idea of fairness in decision making, children and adults differ much less. Children are able to understand the concept of fairness in decision making from an early age. Toddlers and infants, ranging from 9–21 months, understand basic principles of equality. The main difference found is that more complex principles of fairness in decision making such as contextual and intentional information don't come until children get older.
During their adolescent years, teens are known for their high-risk behaviors and rash decisions. Research has shown that there are differences in cognitive processes between adolescents and adults during decision-making. Researchers have concluded that differences in decision-making are not due to a lack of logic or reasoning, but more due to the immaturity of psychosocial capacities that influence decision-making. Examples of their undeveloped capacities which influence decision-making would be impulse control, emotion regulation, delayed gratification and resistance to peer pressure. In the past, researchers have thought that adolescent behavior was simply due to incompetency regarding decision-making. Currently, researchers have concluded that adults and adolescents are both competent decision-makers, not just adults. However, adolescents' competent decision-making skills decrease when psychosocial capacities become present.
Research has shown that risk-taking behaviors in adolescents may be the product of interactions between the socioemotional brain network and its cognitive-control network. The socioemotional part of the brain processes social and emotional stimuli and has been shown to be important in reward processing. The cognitive-control network assists in planning and self-regulation. Both of these sections of the brain change over the course of puberty. However, the socioemotional network changes quickly and abruptly, while the cognitive-control network changes more gradually. Because of this difference in change, the cognitive-control network, which usually regulates the socioemotional network, struggles to control the socioemotional network when psychosocial capacities are present.[clarification needed]
When adolescents are exposed to social and emotional stimuli, their socioemotional network is activated as well as areas of the brain involved in reward processing. Because teens often gain a sense of reward from risk-taking behaviors, their repetition becomes ever more probable due to the reward experienced. In this, the process mirrors addiction. Teens can become addicted to risky behavior because they are in a high state of arousal and are rewarded for it not only by their own internal functions but also by their peers around them. A recent study suggests that adolescents have difficulties adequately adjusting beliefs in response to bad news (such as reading that smoking poses a greater risk to health than they thought), but do not differ from adults in their ability to alter beliefs in response to good news. This creates biased beliefs, which may lead to greater risk taking.
Adults are generally better able to control their risk-taking because their cognitive-control system has matured enough to the point where it can control the socioemotional network, even in the context of high arousal or when psychosocial capacities are present. Also, adults are less likely to find themselves in situations that push them to do risky things. For example, teens are more likely to be around peers who peer pressure them into doing things, while adults are not as exposed to this sort of social setting.
Selective search for evidence (also known as confirmation bias): People tend to be willing to gather facts that support certain conclusions but disregard other facts that support different conclusions. Individuals who are highly defensive in this manner show significantly greater left prefrontal cortex activity as measured by EEG than do less defensive individuals.
Premature termination of search for evidence: People tend to accept the first alternative that looks like it might work.
Cognitive inertia is the unwillingness to change existing thought patterns in the face of new circumstances.
Selective perception: People actively screen out information that they do not think is important (see also Prejudice). In one demonstration of this effect, discounting of arguments with which one disagrees (by judging them as untrue or irrelevant) was decreased by selective activation of right prefrontal cortex.
Wishful thinking is a tendency to want to see things in a certain – usually positive – light, which can distort perception and thinking.
Choice-supportive bias occurs when people distort their memories of chosen and rejected options to make the chosen options seem more attractive.
Recency: People tend to place more attention on more recent information and either ignore or forget more distant information (see Semantic priming). The opposite effect in the first set of data or other information is termed primacy effect.[page needed]
Repetition bias is a willingness to believe what one has been told most often and by the greatest number of different sources.
Anchoring and adjustment: Decisions are unduly influenced by initial information that shapes our view of subsequent information.
Source credibility bias is a tendency to reject a person's statement on the basis of a bias against the person, organization, or group to which the person belongs. People preferentially accept statements by others that they like (see also Prejudice).
Incremental decision-making and escalating commitment: People 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 slope).
Attribution asymmetry: People tend to attribute their own success to internal factors, including abilities and talents, but explain their failures in terms of external factors such as bad luck. The reverse bias is shown when people explain others' success or failure.
Role fulfillment is a tendency to conform to others' decision-making expectations.
Underestimating uncertainty and the illusion of control: People tend to underestimate future uncertainty because of a tendency to believe they have more control over events than they really do.
Framing bias: This is best avoided by increasing numeracy and presenting data in several formats (for example, using both absolute and relative scales).
Sunk-cost fallacy is a specific type of framing effect that affects decision-making. It involves an individual making a decision about a current situation based on what they have previously invested in the situation.: 372 An example of this would be an individual that is refraining from dropping a class that they are most likely to fail, due to the fact that they feel as though they have done so much work in the course thus far.
Prospect theory involves the idea that when faced with a decision-making event, an individual is more likely to take on a risk when evaluating potential losses, and are more likely to avoid risks when evaluating potential gains. This can influence one's decision-making depending if the situation entails a threat, or opportunity.: 373
Optimism bias is a tendency to overestimate the likelihood of positive events occurring in the future and underestimate the likelihood of negative life events. Such biased expectations are generated and maintained in the face of counter-evidence through a tendency to discount undesirable information. An optimism bias can alter risk perception and decision-making in many domains, ranging from finance to health.
In groups, people generate decisions through active and complex processes. One method consists of three steps: initial preferences are expressed by members; the members of the group then gather and share information concerning those preferences; finally, the members combine their views and make a single choice about how to face the problem. Although these steps are relatively ordinary, judgements are often distorted by cognitive and motivational biases, include "sins of commission", "sins of omission", and "sins of imprecision".[page needed]
Herbert A. Simon coined the phrase "bounded rationality" to express the idea that human decision-making is limited by available information, available time and the mind's information-processing ability. Further psychological research has identified individual differences between two cognitive styles: maximizers try to make an optimal decision, whereas satisficers simply try to find a solution that is "good enough". Maximizers tend to take longer making decisions due to the need to maximize performance across all variables and make tradeoffs carefully; they also tend to more often regret their decisions (perhaps because they are more able than satisficers to recognize that a decision turned out to be sub-optimal).
Styles and methods of decision-making were elaborated by Aron Katsenelinboigen, the founder of predispositioning theory. In his analysis on styles and methods, Katsenelinboigen referred to the game of chess, saying that "chess does disclose various methods of operation, notably the creation of predisposition-methods which may be applicable to other, more complex systems.": 5
Katsenelinboigen states that apart from the methods (reactive and selective) and sub-methods (randomization, predispositioning, programming), there are two major styles: positional and combinational. Both styles are utilized in the game of chess. The two styles reflect two basic approaches to uncertainty: deterministic (combinational style) and indeterministic (positional style). Katsenelinboigen's definition of the two styles are the following.
The combinational style is characterized by:
a very narrow, clearly defined, primarily material goal; and
a program that links the initial position with the outcome.
In defining the combinational style in chess, Katsenelinboigen wrote: "The combinational style features a clearly formulated limited objective, namely the capture of material (the main constituent element of a chess position). The objective is implemented via a well-defined, and in some cases, unique sequence of moves aimed at reaching the set goal. As a rule, this sequence leaves no options for the opponent. Finding a combinational objective allows the player to focus all his energies on efficient execution, that is, the player's analysis may be limited to the pieces directly partaking in the combination. This approach is the crux of the combination and the combinational style of play.: 57
The positional style is distinguished by:
a positional goal; and
a formation of semi-complete linkages between the initial step and final outcome.
"Unlike the combinational player, the positional player is occupied, first and foremost, with the elaboration of the position that will allow him to develop in the unknown future. In playing the positional style, the player must evaluate relational and material parameters as independent variables. ... The positional style gives the player the opportunity to develop a position until it becomes pregnant with a combination. However, the combination is not the final goal of the positional player – it helps him to achieve the desirable, keeping in mind a predisposition for the future development. The pyrrhic victory is the best example of one's inability to think positionally."
The positional style serves to:
create a predisposition to the future development of the position;
induce the environment in a certain way;
absorb an unexpected outcome in one's favor; and
avoid the negative aspects of unexpected outcomes.
According to Isabel Briggs Myers, a person's decision-making process depends to a significant degree on their cognitive style.[page needed] Myers developed a set of four bi-polar dimensions, called the Myers-Briggs Type Indicator (MBTI). The terminal points on these dimensions are: thinking and feeling; extroversion and introversion; judgment and perception; and sensing and intuition. She claimed that a person's decision-making style correlates well with how they score on these four dimensions. For example, someone who scored near the thinking, extroversion, sensing, and judgment ends of the dimensions would tend to have a logical, analytical, objective, critical, and empirical decision-making style. However, some psychologists say that the MBTI lacks reliability and validity and is poorly constructed.
In the general decision-making style (GDMS) test developed by Suzanne Scott and Reginald Bruce, there are five decision-making styles: rational, intuitive, dependent, avoidant, and spontaneous. These five different decision-making styles change depending on the context and situation, and one style is not necessarily better than any other. In the examples below, the individual is working for a company and is offered a job from a different company.
The rational style is an in-depth search for, and a strong consideration of, other options and/or information prior to making a decision. In this style, the individual would research the new job being offered, review their current job, and look at the pros and cons of taking the new job versus staying with their current company.
The intuitive style is confidence in one's initial feelings and gut reactions. In this style, if the individual initially prefers the new job because they have a feeling that the work environment is better suited for them, then they would decide to take the new job. The individual might not make this decision as soon as the job is offered.
The dependent style is asking for other people's input and instructions on what decision should be made. In this style, the individual could ask friends, family, coworkers, etc., but the individual might not ask all of these people.
The avoidant style is averting the responsibility of making a decision. In this style, the individual would not make a decision. Therefore, the individual would stick with their current job.
The spontaneous style is a need to make a decision as soon as possible rather than waiting to make a decision. In this style, the individual would either reject or accept the job as soon as it is offered.
There are a few characteristics that differentiate organizational decision-making from individual decision-making as studied in lab experiments:
Unlike most lab studies of individual decision-making, ambiguity is pervasive in organizations. There is often only ambiguous information, and there is ambiguity about preferences as well as about interpreting the history of decisions.
Decision-making in and by organizations is embedded in a longitudinal context, meaning that participants in organizational decision-making are a part of ongoing processes. Even if they don't take on active roles in all phases of decision-making, they are part of the Decision Process and its consequences. Decisions in organizations are made in a sequential manner, and commitment may be more important in such processes than judgmental accuracy. In contrast, most lab studies of individual decision-making are conducted in artificial settings (lab) that are not connected to the subjects’ ongoing activities.
Incentives play an important role in organizational decision-making. Incentives, penalties, and their ramifications are real and may have long-lasting effects. These effects are intensified due to the longitudinal nature of decision-making in organizational settings. Incentives and penalties are very salient in organizations, and often they command managerial attention.
Many executives, especially in middle management, may make repeated decisions on similar issues. Managers may develop a sense of using his/her skills (which may be faulty) and a sense of having control and using one's skills are pervasive in managerial thinking about risk taking. Several repeated decisions are made by following rules rather than by using pure information processing modes.
Conflict is pervasive in organizational decision-making. Many times power considerations and agenda setting determine decisions rather than calculations based on the decision's parameters. The nature of authority relations may have a large impact on the way decisions are made in organizations, which are basically political systems.
^Hunt, L. T.; Daw, N. D.; Kaanders, P.; MacIver, M. A.; Mugan, U.; Procyk, E.; Redish, A. D.; Russo, E.; Scholl, J.; Stachenfeld, K.; Wilson, C. R. E.; Kolling, N. (21 June 2021). "Formalizing planning and information search in naturalistic decision-making". Nature Neuroscience. 24 (8): 1051–1064. doi:10.1038/s41593-021-00866-w. PMID34155400.
^Mann, Leon; Harmoni, Ros; Power, Colin; Beswick, Gery; Ormond, Cheryl (July 1988). "Effectiveness of the GOFER course in decision making for high school students". Journal of Behavioral Decision Making. 1 (3): 159–168. doi:10.1002/bdm.3960010304.
^Myers, Isabel Briggs; Kirby, Linda K.; Myers, Katharine D. (1998) . Introduction to type: a guide to understanding your results on the Myers-Briggs Type Indicator. Introduction to type series (6th ed.). Palo Alto, CA: Consulting Psychologists Press. OCLC40336039.
^Martinsons, Maris G. (December 2006). "Comparing the decision styles of American, Chinese and Japanese business leaders". Best Paper Proceedings of Academy of Management Meetings, Washington, DC, August 2001. SSRN952292.