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[[File:Ralphstaceypic.jpg|200px|thumb|right|Figure 1: Ralph Douglas Stacey, Source: http://www.canterbury.ac.uk/news/newsRelease.asp?newsPk=881]]

The Stacey matrix model was proposed by Ralph Douglas Stacey. It gives the possibility to distinguish management decisions and deal with complexity and uncertainty in organization platform. The result is brought out by usage of the two dimension Stacey matrix. It allows to compare the level of agreement with the degree of certainty. The decision can fall into the following areas of the matrix for further analysis: Simple, Complicated, Political, Chaotic.

== The strategic choice theory ==
Ralph Stacey defined management and organization dynamics in frame of the theory of strategic choice. In this view the organization changes over time in a direction chosen by the most powerful individual or small group of managers. The theory of strategic choice displays its theoretical origin in two main pillars; cybernetic system theory and cognitivist psychology. Cybernetic theory is highly focused on control and regulation of a system which helps to guide and return into the state of stabile equilibrium and reach the desired destination. the cognitivist psychology describes the nature of human behavior in this context.

In the aspect and understanding of strategic choice, an important parameter is to consider the cause and effect of uncertainty and conflict.

== Outline of the Stacey matrix ==
[[File:Staceymatrix11pic.jpg|800px|thumb|right|Figure 2: The Stacey matrix, Source: http://be-in-unison.com/wp-content/uploads/2014/02/staceymatrix1.jpg]]

The Stacey matrix model introduces the phenomenon of strategic choice in the organization management by taking uncertainty and management agreement into account.

=== Background ===
As antecedent representatives, Thompson and Tuden (1959) have already related to the effect of uncertainty on decision-making mode in a similar manner. They defined that uncertainty originate in the lack of clarity and the lack of agreement over objectives. Managers are mentioned as objectives. This alines with the theory of Ralph D. Stacey (2000).
<ref>[''Strategic choice and Stacey matrix''] ''Ralph D Stacey (2000) "Strategic Management and Organization Dynamics, The challenge of Complexity", ''Pearson Education, England'' ''</ref>

=== The Stacey matrix ===
If the causal connections are clear meaning a high or far certainty is faced beside having shared objectives in agreement, this provides the conditions for the managers for a simple decision-making case. In Figure 2, it is showed by the area called ''Simple''. In this situation, the management take the decisions in a rational, logical way. When the aimed direction, destination and circumstances are clear at a company, this can be the case of certain decisions. The right answer exists and a simple fact-based, traditional management situation arises. Although, as they move away from this field, the application of rational logic will be impossible and they need to use different approaches.

When the causal connections are still clear, there is a high certainty but managers conflict then the decision has to be made on ''Political'' manner. This proposes that the one with the biggest power will dominate and the strongest individual who builds coalitions will control the decision-making. Here it is an important aspect to build relationships, negotiate and compromise in order to gain further steps. 

When the managers agree on the desires aimed to achieve but the causal connections make the situation unclear and uncertain how to do it, then it falls into the zone of so called ''Complicated''. The usage of judgmental or intuitive modes of decision making is necessary to execute. In this case, more than one right answer is possible, therefore, the feasibility is judged with the interaction and coordination of expertise. The reasoning is mostly analog. They need think in a literal way, taking trial-and-error cases into account to progress into decision.

The most problematic situation is when there is no agreement nor certainty, all is unclear and the objectives conflict. This level of complexity is referred as ''Chaotic''.  The atmosphere can be decried with the main factors of tension, turbulence and lack of any patterns. In an organization this is a situation which really needs to be avoid. Here the manager has to decide based on intuitive individual judgement combined with the political interactions of the group.
<ref>[''Strategic choice and Stacey matrix''] ''Ralph D Stacey (2000) "Strategic Management and Organization Dynamics, The challenge of Complexity", ''Pearson Education, England'' ''</ref>