Project Management

Disciplined Agile

by , , , , , ,
This blog contains details about various aspects of PMI's Disciplined Agile (DA) tool kit, including new and upcoming topics.

About this Blog

RSS

View Posts By:

Tatsiana Balshakova
Mark Lines
Mike Griffiths
Scott Ambler
Bjorn Gustafsson
Curtis Hibbs
James Trott

Past Contributors:

Joshua Barnes
Michael Richardson
Daniel Gagnon
Valentin Tudor Mocanu
Kashmir Birk
Glen Little
Klaus Boedker

Recent Posts

DA 5.6 is released

Disciplined Agile 5.5 Released

Choose Your WoW! Second Edition Is Now Available

Requisite Agility applied in Project Management

Disciplined Agile and PMBoK Guide 7th Edition

Two velocities: Gross vs Net.

A few years ago, in Dr. Dobb’s Journal I wrote about estimating on agile development projects.  In that article I discussed burndown charts and how to extend them to show an estimation range.  The basic observation is that there is really two velocities exhibited by a team, the gross velocity and the net velocity.  The gross velocity which is the amount of work they complete in an iteration, which is what a regular burndown chart shows.  The net velocity is the change in the amount of work still to do, which is the amount of work completed in an iteration less the added amount of functionality that iteration.

Image

So, as the diagram depicts if a team completes 20 points of work in an iteration but 5 extra points of work was added by the stakeholders, the gross velocity is 20 points whereas the net velocity is 15 points.  If there’s 230 points on the stack then the gross velocity implies that there are 12 iterations left and the net velocity 16 iterations, providing you with a ranged estimate.

Given that we now have two velocities to chart, not just one, this leads us to evolve burndown charts into what is called ranged burndown charts.

Posted by Scott Ambler on: December 07, 2011 11:24 AM | Permalink | Comments (0)
ADVERTISEMENTS

"The secret of getting ahead is getting started. The secret of getting started is breaking your complex overwhelming tasks into small manageable tasks, and then starting on the first one."

- Mark Twain

ADVERTISEMENT

Sponsors