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What model is the project manager taking?

A Stacey Complexity Model

The project manager is using the Stacey Complexity Model to plot the degree of certainty about the complexity elements, such as requirements, technical challenges, or team skills. This model displays levels of uncertainty from low to high on both the x- and y-axes, or it may show levels of uncertainty on the x-axis and agreement levels on the y-axis. This two-dimensional model shows the progression of the certainty and agreement of complexity elements, which are plotted into categories such as simple or chaotic.