from commonsense, physics and maths to kanban
TRANSCRIPT
From Commonsense, Physics and Maths
to Kanban
Tathagat Varma http://thoughtleadership.in
World’s Worst Traffic Jam, Beijing-Hong Kong-Macau Highway, 6-Oct-2015
Why did it happen?
• New checkpoint merged 50-lane highway to 20 lanes, thereby creating a bottleneck
http://www.autoblog.com/2011/03/05/the-science-behind-traffic-jams-infographic/
http://ww2.kqed.org/lowdown/2013/11/12/traffic-waves/
Let’s consider software
Incoming OutgoingAction
Scenario A:Incoming < Outgoing
Incoming
5/hour
Outgoing
5/hour
Action
10/hour
Scenario B:Incoming = Outgoing
Incoming
10/hour
Outgoing
10/hour
Action
10/hour
Scenario C:Incoming > Outgoing
Incoming
20/hour
Outgoing
10/hour
Action
10/hour
Scenario D: Mixed priority incomingIncoming
URGENT: 2/hour
NORMAL: 8/hour
LOW: 10/hour
Scenario E: Random arrival times
Incoming
5/hour…..10/hour…..8/hour…..20/hour…..13/hour…..
Real Life:A + B + C + D + E +…
Scrum Task Board
Challenges…
• No congestion-control • No priority-handling • High(er) Work-in-Progress
Kanban System
Kanban Board
Lean Kanban• Visualize the workflow
• Limit Work-in-Progress
• Measure and Manage Flow
• Make Process Policies Explicit
• Evaluate improvement opportunities
A sample workflow
Limit the WIP!
Measure the flow
Swim lanes
Prioritisation based on Class of Service
Benefits of Kanban
• Congestion control: Continuous flow
• Inventory control: Prevents overproduction
• Better visibility: Visualisation of work flow
• Higher adaptability: Priority-based scheduling
References• This insane Beijing traffic jam will make you thankful for your commute, http://mashable.com/
2015/10/07/insane-beijing-traffic-jam/#37uMD44tkkq4
• Here’s the Physics Behind That Insane Chinese Traffic Jam, http://gizmodo.com/heres-the-physics-behind-that-insane-chinese-traffic-ja-1735638335
• What are Traffic Waves and Why Do They Happen So Much?, http://ww2.kqed.org/lowdown/2013/11/12/traffic-waves/
• A Mathematician has the Perfect Explanation for Why Traffic Jams Happen, http://nextshark.com/why-traffic-jams-happen/
• Solving the Traffic Congestion Problem, http://www.ncpa.org/pub/ba773
• Kanban Highway: The Least Popular Mario Kart Course, https://danslimmon.wordpress.com/2015/06/05/kanban-highway-the-least-popular-mario-kart-course/
• What is a Kanban Board, http://www.swiftkanban.com/kanban/what-is-a-kanban-board/
• Kanban Reference Card, DZone