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Sunday, February 27, 2005
The Iron Triangle and Independent Variables
Stuart asked the question about the difference between a Spider Diagram and the Iron Triangle.

* The Iron Triangle tries to portray there are three variables in a project: Time, Cost and Scope. They are connected in an "iron triangle." If one moves - gets larger - then the other two are effected in some way. Usually this way is they have to get larger as well. Imagine stretching one side the triangle, then to other tow side grow in proportion. The problem of course is the mechanics of the triangle have strange behaviors in practice. I can stretch the time and not impact the scope but just the cost, but pulling on the top of the triangle. I could pull on the lower right corner and stretch the Cost and Schedule leaving the time the same.

But this of course is an oversimplification of real projects.

* The Spider diagram provides more dimensions and also provides a description of the interaction between these dimensions that MAY not impact other dimension. It is assumed and in fact mandatory in the Iron Triangle for at least one other dimension to change in response to ANY change.
* The Spider diagram shown in the example allows a two stage change between the variables. The Spider diagram (actually a Spider Chart) was developed in the product marketing domain, to show relationships between products.

So to answer Stuart's question:

* More dimensions
* More independence between variables
* An arbitrary number of variables


# posted by Glen B Alleman : 7:20 PM 0 comments