## Interaction between Project Class, Process Effectiveness and Team Strength

How do the three parameters — Project Class, PE, and TS — interact? With 5 classes and 11 possible levels for both PE and TS, we have a three-dimensional space with 605 possible values at the intersections.

While 5 project classes seem appropriate, eleven levels for PE and TS seem excessive. Yet people seem to gravitate to evaluating these parameters on a "10-point" scale, even though no one can estimate them with such accuracy. All one can reasonably expect is that if PE or TS is claimed to be 7, it is somewhere between 6 and 8. Certainly any digit after the decimal point is pure fantasy.

Our ability to estimate the input with limited accuracy leads to a similar conclusion with respect to the output. A success percentage of 62% means "somewhere between 60% and 70%," and likely closer to 60% than 70%. Results should be rounded up or down to the nearest 5%.

The self-documenting nomogram shown in Figure 3 allows one to obtain a prediction of project success. Here are the steps:

1. Determine which of the five classes most resembles your project. This is your project class.
2. Determine the strength of your team (TS) on a scale of 0 to 10, and the effectiveness of the process (PE) you will use, also on a scale from 0 to 10.
3. Locate your values for TS and PE on the axes that are appropriate for your project class.
4. Connect the two points with a straight line.