Posted on July - 17 - 2011
On Data Collection and the Moon
Better hope it's pointed exactly right
There’s a popular cliché amongst rocket scientists “a launch that is off by one degree will miss the moon by miles.” Okay, so maybe the authenticity of that phrase is leaves a lot to be desired, but the spirit of the statement – the accuracy of a rocket is only as sound as the accuracy of the initial trajectory – makes a lot of sense. Even a target as big as the moon can easily be missed if the foundation is shoddy.
How does this relate to software estimation? Easy, your estimate is built on data collection, and your initial data collection creates your foundation. As you collect your data, the results compile into the launch structure that will put your estimation rocket on the correct path.
Cheesy metaphors aside, there are some best practice tips for ensuring that your data collection is accurate and you don’t miss the moon.
Customized Worksheets are a must. A standard worksheet is good, as it allows for data to be collected in a uniform fashion. A custom worksheet allows for a more complete and tailored set of data to be collected. Doing so allows you to flesh out the project more so before hand.
Break the worksheet down into components of the project. If you’re working on a large piece of software, this means a separate worksheet for each CSCI. For other project estimates, say for manufacturing, you’ll need to make worksheets for each step of the fabrication process.
Make sure your collected data jives. Double check your numbers. Make sure the vision of your estimate is on par with what the customer envisioned. Check to make sure that any necessary resources (contractors, developers, etc) are available.
Once you have these issues sorted out, you should have a nice foundation for your project. You have the forest and you can move to sketching out the trees.
Related articles
- Data Driven Estimating Part 1: How Data Feeds The Estimation Modeling Paradigm at Galorath / SEER (galorath.com)
- FCC Investigating Google Street View Wi-Fi Data Collection (yro.slashdot.org)
- New Study by Krux Digital Shows Data Leakage on Popular Websites (drdianehamilton.wordpress.com)
