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Running Mob Programming How we made our team x 4 faster

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Ikuo Suyama @martin_lover_se ➔ From Tokyo, Japan ➔ ’LODEO’, CyberAgent ➔ Backend Engineer ➔ Apprentice Agile Coach

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Mob Programming "Mob Programming A Whole Team Approach" Agile 2014, Woody Zuill “On the same thing... At the same time... In the same place... On the same computer...

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Our Mobbing Style

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Our Mobbing Style ➔ Session ◆ 1 Session is 45 min ◆ Taking 5 - 10 min rest at each session ➔ Changing Driver frequently by timer ◆ Changing driver at 5 - 15 min ◆ All participants can be a driver at each session For keeping Concentration

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Our Mobbing Style “for an idea to go from your head into the computer, it MUST go through other's agreement. The driver can also join the discussion

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Just following these rules, Our results x 2 faster than ever!

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X 2…?

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X 4, wasn’t it…?

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Yes, We SCALE our Mob.

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Initial Approach: Scale-UP ➔ start from 3 people ➔ Increment to 6 people...

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Scale-UP: Problem Efficiency (1 / leadtime) Number of people Note: This data is NOT accurate

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Note: This data is NOT accurate ➔ It doesn’t scale linearly ➔ Sweet spots is 3 - 4 people Scale-UP: Problem Low Resource Efficiency Resource Efficiency is getting worse

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The Solution: Scale-OUT

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Scale-OUT: Synced-Mob

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Scale-OUT: Synced-Mob Keep the lines of communication open

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2 mobs work together! Scale-OUT: Synced-Mob On the same thing... At the same time... In the same place... But different tasks

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Scale-OUT: Synced-Mob Reducing Sync point ➔ Mob Feature planning ◆ Independently Task Slicing ➔ Mob interface design & implementation ◆ Starting define interface with all

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Scale-OUT: Synced-Mob X2 FASTER!! X2 FASTER!! Quite simple, but it works well!!

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If we got only 5 people…?

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Like This…?

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Oops! JOYFUL! EXHAUSTED…

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Oops! JOYFUL! EXHAUSTED… Tend to Avoid…

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Solution: Double-Linked Mob

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Double-Linked Mob Same effectivity as 3-3 synced mobs! ➔ Linking-Navigator ◆ 2 Mobs connect with navigator ◆ Rotate linking-navigator at each session ◆ Easy to found problems between each mobs

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1/2 lead-time mob, X 2 parallel we got x 4 faster!

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➔ Using Mob, we got x 2 faster ➔ To achieve x 4 faster ◆ Scale-UP ● Cause low-resource efficiency ◆ Scale-OUT ● Synced-Mob ● Double-Linked Mob Conclusion

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Twitter: @martin_lover_se Thank you for your kind attention!