Little’s Law | Glossary

Definition

Little’s Law states that in possession of a stable system, the average number of customers within it, is equal to the average rate of consumer arrivals multiplied by the average time a consumer usually spends in the overall system.

Little’s Law is expressed as L= λW.With ‘L’ as the average number of customers, ‘λ’ being the average arrival rate, and ‘W’ being the average time in the system. This law got it’s name on John Littel, who proposed it in the mid-1990s.

Further Reading

  • “Building Intuition: Insights From Basic Operations Management Models and Principles” (book), by John D.C Little.

Iteration Burn Down | Glossary

Definition

The ‘Iteration Burndown’ displays the remaining work and the amount completed within the iteration. It is to be proactively anticipated whether the committed work will be able to get delivered by the iteration end date. It’s also useful during iteration retrospective meetings to help identify events during the iteration, or planning.

The features comprised include:

  • Blue bars for remaining task hours
  • Green bars for completed story points
  • Ideal burndown rate is a black line, based on task estimate
  • Hover over the bars/line to see detailed figures on current/past progress.

Further Reading

  • “Agile & Iterative Development : A Manager’s Guide 1st Edition” (book), by  Craig Larman.