blog Archive

Work item effort and priority; single or dual Queue

The other day I went to a Japanese restaurant for a snack. Small order – Temaki     Large order – Combinado     I was very hungry and wanted something simple and fast. I ordered one temaki. Unfortunately, it took me more than 30 minutes to get my temaki. Needless to day, I left
Category: Flow

Stable System, WIP limit and Pull System

On myprevious blog post, I wrote that WIP limit and Pull system are the guiding rules that make a system stable.   I decided to make a visual representation for Stable System, and explore the what-if conditions for WIP limit and Pull System.  Please note that only WIP limit or only Pull System do not
Category: Flow

Little’s law and stable systems

Little’s law is defined in terms of stable systems. On my previous post, I have described my bar as a stable system: “Whenever a bottle finishes, I remove it from the bar. Then I open a new one, and add it to the bar. My bar is a stable system: the rate at which whiskey
Category: Flow

Lead time: Applying Little’s Law to track it

“The average number of work items in a stable system is equal to their average completion rate, multiplied by their average time in the system.” ~ John Little, 1961 The text above is from “A Proof for the Queuing Formula” by Little, J. D. C. (1961). It is knows as the Little’s law. By solving
Category: Flow

Lead Time – three extremely simple ways to manually track it

Lead time—the time elapsed from the work start to  completion– is important and is a key performance indicator (KPI) that every Agile team should track. Poor lead time causes bottlenecks in the team production flow, inefficiencies, delay costs, not to mention unhappy customers. Below are three extremely simple ways to manually track it on your
Category: Flow

Continuous Delivery: lead time and cycle time

I have seen quite a few people mixing up these terms: lead time and cycle time. I am not sure about the reason for the confusion.  I think Continuous Delivery provides a great example for explaining each one of these important parameters: lead time and cycle time. Manufacturing Lead time and cycle time are concepts
Category: Flow

What is A/B Testing? by Guilherme Motta

Guest article by Guilherme Motta This evening I received an email asking what A/B Testing was about. After replying to the email, I felt/like writing about my understanding on  A/B testing;  what is it and what it is not. Basically, think as if you could achieve the same goal by taking different approaches, measuring its results
Category: MVP