My last post was on modifying Parking Lot Diagrams to use the area of boxes to show the relative effort of differing parts of the system. The idea was that while traditional Parking Lot diagrams are a great way of summarizing progress at a project level, the customary approach of giving all the feature groups the same size box may lead people to believe these chunks of functionality are of equivalent size or complexity.

In the boxes below, the number in brackets describes the feature count, but this requires people to read the numbers and then consider the relative sizes. My goal was to create a new graphical summary that depicts the relative sizes via box area to make the summaries easier to understand.

So a standard Parking Lot diagram like this...

becomes a scaled Parking Lot diagram like this...

In the second example we can quickly see the relative estimated sizes of the areas of work, with for example, “Enter Order Details” being three times the size (in area) of “Create New Order”. In this example to keep things simple, I am using feature count (15 vs 5) to depict effort and area. Most projects will use development effort in points or person days as the scaling factor.

Anyway, I have been using these scaled Parking Lot diagrams on my projects for a while, created quite laboriously in Excel and PowerPoint, and I was hoping that someone with better skills than I have could help me streamline the process. Well, in typical fashion, soon after posting I learned that:

A)    I may be asking the wrong question
B)    My invented solution has already been done before and far more elegantly
C)    It has been done on the Simpsons

Oh, the joy of the internet! Actually this is of course a great thing and now I can progress from a much firmer foundation, and far quicker than my slow evolution was taking me...

Parking Lot diagrams are a great way of summarizing an entire project’s progress and status onto a single page. They illustrate work done, work in progress, work planned and identify what is behind schedule.
 
In this example we can see that “Stock Search” in red, is behind, it was due to finish in November. “Create New Order” shown in green is complete, the boxes in yellow are ‘in progress’ and those in white have not been started yet. I have posted previously about their use and examples of how to produce them.

However, they miss an important element, the relative sizes (usually in terms of effort, but could be cost or risk) of the functional areas. So, in the example above, the fact that “Enter Order Details” might be 3 times the development effort of “Create New Order” is likely lost on the stakeholders reviewing the chart. Sure they can look at the number of features 15 vs 5 and likely surmise “Enter Order Details” is more work, but upon first impression, this is not immediately apparent.

So, bring on Scaled Progress charts, the box size represents estimated development effort. I have been using these with my current Steering Committee for a while. I meet some of these people infrequently and these charts provide a nice reminder of the overall project scope and where the project progress right now.