Friday, August 12, 2011

Lead time vs cycle time; from Manufacturing to SW development

I have seen different definitions for lead time and cycle time in the Agile and Kanban communities (for SW development).

From Lean manufacturing:

lead time is the time between the initiation and delivery of a work item.

cycle time is the time between two successive deliveries

In my opinion, this translates directly to Agile SW development like depicted in the photos below.

For a typical Agile development team the workflow is something like:

Backlog -> Ready for Dev -> In Dev -> Ready for Validation -> Validating -> To Be Deployed -> Deployed

Next is a sequence of photos from a card wall depicting these concepts. Please have in mind that I am only showing two stories for illustrative purpose.





lead time is the time between the initiation and delivery of a User Story; in our case it is the time a Story enters the Deployed stage minus the time the story has entered the Backlog stage. Story 34 has entered the Backlog in day 4, and enters the Deployed stage on day 11; lead time equals 7 days (day 11- day 4).

cycle time is the time between two successive deliveries; in our case it is the the time between two stories entering the last stage-- Deployed stage in this case. 34 enters the Deployed stage on day 11, then two days after, the next story-- Story 37--enters the Deployed stage; cycle time equals 2 days (day 13 – day 11).

These metrics should be collected for the set of Stories the team has delivered,. This way you can get the average lead time and average cycle time, two powerful process improvement metrics.

Varying the WIP limits on the workflow stages (assume the same set of Stories, and the same team members) will affect the average lead time and the average cycle time.

This is what the workshop I have been running is all about!

My hypothesis is that after people participate on the workshop they will have experienced the Little’s Law.

Little’s Law: Lead Time = Cycle Time x WIP

On the next blog entries I will write about the Little’s Law and the workshop.


11 comments:

weddingca said...
This comment has been removed by a blog administrator.
Michele said...

I have read many, many pages about Kanban and this subject was always clear as mud. When I finally understood that cycle time is just the inverse of throughput (from another simple example, http://agiletips.blogspot.com/2011/08/little-law-cycle-time-and-throughput.html) I got the feeling that most people either don't understand the difference between cycle time and lead time or they don't know how to convey their knowledge. Thanks, I think I understand it now.

rsgoldfeng said...

This idea buy Diablo 3 goldlocated mind when i do dump me a new window connected with whisky. That it was the very last amount of your Macallan Twelve jar. I taken out your empty jar on the tavern, Cheap GW2 Goldin addition to took a note to obtain a different one.

dzzfd said...

Ich habe viele, viele Seiten über Kanban zu lesen und dieses Thema war immer klar, wie Schlamm. Als ich endlich verstanden, daß die Zykluszeit nur die Umkehrung der Durchsatz (von einem anderen einfachen Beispiel gw2 gold
FFXI GIL
ist bekam ich die das Gefühl, dass die meisten Menschen entweder nicht verstehen den Unterschied zwischen Zykluszeit und Durchlaufzeit oder sie nicht wissen, wie sie ihr Wissen zu vermitteln. Danke, ich glaube, ich verstehe es jetzt

qiongzhang55 said...

Wow, you are amazing! best cheap android phones I love everything about this.

ibaikaltablet said...

Perfect Günstiges android-Handy ohne Vertrag online kaufen! I really want to buy it!

ada3martin said...

Perfect Iphone 5 cases I really want to buy it!

Unknown said...

Very interesting post. Thanks for sharing it! It is always a joy to learn something that I didn't know. I have you to thank for teaching me something new.

see here my post Lead oxide Manufacturers

Lead Ingots Manufacturers

Riya Sen said...

ESCORTS SERVICES AVAILABLE 24X7 HR CALL GIRLS SERVICES VISIT OUR ESCORTS KEYWORDS -
1. www.sexybindu.in
escorts service mount abu | mount abu escorts service |escorts service mount abu |escorts service mount abu |mount abu escort | independent escorts mount abu |
call girl service mount abu | escorts mount abu | mount abu escorts | mount abu escorts services |escorts service mount abu |
escort service ahmedabad | ahmedabad escorts service | call girl service ahmedabad | ahmedabad escorts

2. www.mountabuescorts.com
mount abu escorts | escorts service mount abu | call girl service mount abu | mount abu escort | call girl in mount abu |
| mount abu escort service
3. www.mountbuescort.in
escort service mount abu | escorts services mount abu | mount abu escorts services | call girls service mount abu | mount abu escorts
| call girl mount abu |
4 www.nayraescorts.com
Escorts Service Mount Abu | Mount Abu Escorts | Mount Abu Escort | Call Girl Service Mount Abu | Mount Abu Escorts Services |
| Mount Abu Escort Service | Call girl Service Abu road |

5. www.vipmountabuescorts.in
| Mount Abu Escorts | Call Girl Service Mount Abu | Mount Abu Escort | Mount Abu Escorts Services |
Escort Service Mount Abu |

VISIT FOR ESCORTS & CALL GIRL SERVICES -

http://www.vipmountabuescorts.in
http://www.nayraescorts.com
http://mountabuescort.in
http://www.mountabuescorts.com
http://sexybindu.in
http://www.varshachowdary.com/

Anjali Arya said...



We have a List of Girls who are in financial problems. They need your help. They are ready to sleep with you in some small amounts. Call us for their contact no and help them. To book an escort just drop a call to the given number and ask them what kind of service you want!. You will also WhatsApp us for the availability of our Russian Escorts in Delhi. If you’re in the end determined and ready to enjoy the amusing of being at duration the corporate of one of our beautiful girls. Check our other Services...
Russian Escorts in Delhi
Russian Escorts in Delhi
Russian Escorts in Delhi
Russian Escorts in Delhi
Russian Escorts in Delhi

Riya Sen said...


OurIndependent Call Girls in Lucknow have smooth bodies that can prepare you for a night of sexual loving. You don’t want to feel self-conscious as you’re safe here at our Call Girls agency. Our Services are all-time service that is accessible for you 24*7 hours. Our Escorts Girls are always prepared to make you fill you’ll have a fantastic alluring night with our lovely girls and you only need for believing simultaneously. Check our other Services also...
Lucknow Call Girls Service
Call Girls in Hotels in Lucknow
Escorts in Lucknow
Escorts Service in Lucknow
Housewife Escorts in Lucknow
Hi Profile Escorts in Lucknow
Air Hostess Escorts in Lucknow