Intro to Agile: Scrum vs. Kanban

Intro to Agile(Scrum & Kanban)

by Craig L. Jones

[email protected]

© Craig L. Jones, 2011-13. All rights reserved.

mailto:[email protected]

32 Years Software Development

14 Years Agile (mostly XP, Scrum, & Kanban)

CSM & Scrum Coach

Recovering Over-engineer-er

http://tech.picsauditing.com

http://tech.picsauditing.com/

AgileScrum

Kaizen

Scrumban

Le a n

KanbanXP

Late 40's (Japan & Europe) Late '90's (Global)

Agile

XP

Scrum DSDM

Crystal Clear

RUPkanban

Kaizen

Six Sigma

BSC

TQM

Lean

ISO 9000

CMM

Kanban

Drum-Buffer-Rope

MRP

CONWIP

ScrumScrumBan

Scrum

Scrum

Scrum

Rugby term for “huddle” – refers to the “Daily Scrum” (stand-up meeting)

Scrum Team

● One Product Owner (representing many stakeholders)

● One Scrum Master

● Many Developers (7 ± 2)

Product Owner

● Represents all of the stakeholders - “a single, wringable neck”

● Understands the big picture and the value each story brings to it

● Considered the hardest job in the company (if done well)

Scrum Master

● Coaches everyone on the Scrum process● Facilitates the ceremonies● Stats Tracker● Impediment Unblocker● Half-time job (if done well)● Might also Scrum Master a second team, or● Might also be a Developer● Must NOT also be the PO

Developer

● Cross-Functional (anyone devoted to the product development)

● Programmers (front end, back end, database)● Designers (UX, packaging, industrial)● Writers (tech, copy)● Artists● Testers (SDET, ad-hoc, certification)

Scrum “Ceremonies”

● Backlog Grooming (ongoing)● Sprint planning (first 5% of the Sprint time; thus

2-8 hours)● Daily Scrums (15 min)● Sprint Demo (1-2 hours)● Retrospective (<1 hour)

Scrum Artifacts

● Vision & Mission Statements● Product Backlog● Definition of Ready● Definition of Done● Sprint Backlog● Burndown Charts● Burnup Charts● Velocity Record

Definition of Ready / Done

● Service Level Agreements for inbound/outbound work.

● Ready: Guarantees made to the team before a ticket is placed in the “Ready” column for them to pick up and process

● Done: Guarantees made by the team when a ticket is completed.

● Done: Most importantly lists what's not done (e.g. internationalization/localization).

Burndown Chart

Sprint Planning

● Story 1 (13 pts)

● Story 2 (3 pts)

● Story 3 (8 pts)



● Story 6 (3 pts)

● Story 7

● Story 8

● Story 9

● Story 10

● Story 11

● Story 12

● Story 12 (1 pt)

● Story 9 (5 pts)


● Story 2 (3 pts)

Prioritized Product Backlog Sprint Backlog

During Sprint planning, the developers suggest that, even though Story 12 is not highly valued by the PO, it's a quick win (1 point) and something everyone can rally around. They also suggest that Story 9 is high risk and ought to be tackled early. The PO agrees.

All other things being equal, Stories 1 & 2 are pulled from the top of the prioritized backlog.

A Scrum Board

Ready Test DoneDevDesignStory

White = Story (4x6 cards and blue masking tape)Yellow = Sub-Task (3x3 Post-It note)

A Scrum Board


A Scrum Board


Stories stay in the left column while tasks progress to the right

A Scrum Board


A Scrum Board


A Scrum Board


A Scrum Board


Product Backlog

● Epics● User Stories● Technical Stories● Bug Tickets

– or –

● Epics● Features

– User Stories– Technical Stories– Bug Tickets

Product Backlog

● Portfolio of Epics (18 month horizon)● Program of Features (9 month horizon)● Roadmap of Stories (3 month horizon)

Story Template

As a _______________________, I want ______________________ so that ______________________

“As an administrator, I want a way to control which users can perform which tasks, via roles and permissions, so that we can pass a Sarbanes Oxley audit.”

Acceptance Test

Given _______ and _______When _______ and _______Then _______ and _______

Given that I am logged in as an administrator, when I create a user John, and I create a role Clerk, and I assign the ReconcileReport permission to the Clerk role, and I make John a Clerk, then John should be able to log in and print the Reoncile Report.

INVEST = Well-Written Stories

● Independent● Negotiable● Valuable● Estimable● Small● Testable

INVEST = Well-Written Stories

Small vs. Independent______

As small as possible, yet still has intrinsic value

Kanban

Kanban means “Sign Board”

Kanban is an element of just-in-time (JIT) production, as invented by Taiichi Ohno for

Toyota in the late 1940's – based on studies of inventory systems used in supermarkets

at the time.

kanban card = “signal card”

“kanban” with a lower-case “K”

kanban card = “signal card”

“Kanban” System

“Kanban” with a Capital “K” refers to a system (framework) for tracking work in progress.

“Signal” Cards Work Cards

Kanban & Scrum Share...

● Easy to Learn the Basics● Big, Visible Charts● Regular Cadence● Retrospectives (“Inspect & Adapt”)● Cross-Functional Collaboration● Maximizing Value (by Eliminating Waste)● Early Feedback ● Formal Definitions of Ready/Done

Kanban vs. Scrum

● It's all just “Work”

● Steady “Flow” by Limiting Work in Progress (“WIP”)

● Measure Cycle Time & Throughput

● “Pull” System

● Stories, Epics & Tasks

● Incremental Delivery via (2 week) Sprints

● Measure Velocity

● Sprint Planning/ Negotiating

How to Choose?

Kanban:● Operations Work● Software

Maintenance Work● Coming from Rigid

Legacy Methods (Waterfall)

● Compartmentalized, Siloed Teams

Scrum:● Greenfield Project● Many Stakeholders● Must Coordinate

Around a “Roadmap”● Lots of Epic Stories

A Simple Kanban Board

Ready Doing Done

No distinction between Stories and Subtasks. They are all just Tasks.


Ready Doing Done

Vertical “Lanes”


Ready Doing Done

“Sub Lanes”


Ready Doing Done

Horizontal “Swim Lanes”

!


Ready (3) Doing (3) Done

“WIP Limits”

A Software Dev Kanban Board

Ready (6) Test (5) Done

Example of a team workflow with progressive steps (by different handlers)

Dev (3)Design (3)

An Event-Planning Kanban Board

Ready (6) Finalize (5)

Done

Example of a (one-person) workflow with phases – nothing to do with engineering work

Short List (3)

Research (3)

The Broader Picture

Ready (3) Doing (3) DoneBacklog Reflect

A Typical Kanban Board for Software Development

Ready (6) Test (5) DoneDev (3)Design (3)

“Pulling” Kanban Cards


Sub-lanes show when steps are completed (ready to be pulled)

Dev (3)Design (3)

Available to be pulled

Still in progress

Why Limit Ready Column?

● Enforces delaying decisions until last responsible moment

● It's how the Product Owner “negotiates” with the team – PO (representing stakeholders) decides what, Team decides in what order (by pull)

● Work is tracked according to the time it enters the Ready column until it lands in the Done column (“lead time”). A ready limit makes that meaningful.

Highlighting Priorities


!

Some options: Notation symbols on the cards, color coding of the cards, sub-lanes, or a combination thereof.

Dev (3)Design (3)

!

B A

Differentiating Work


Feature (value to customer)

Dev (3)Design (3)

! !

Infrastructure (value to team)

For example...

Flagging Impediments


Impeded

Dev (3)Design (3)

! !

Flagging Impediments


Impeded

Dev (3)Design (3)

! !

Impeded work is still WIP-limited

What About Story Size?


It doesn't seem to matter. Kanban case studies, so far, indicate that it's much more lucrative to be concerned

with idle time between activity than the activity time itself.

Dev (3)Design (3)

Adjust them? Denote them? Track them?

Kanban Analysis Types

● By reflecting on outlier stories● By looking for patterns on the Kanban Board● By tracking cycle time● By tracking flow

Reflecting on Outlier Stories


_

Backlog Reflect

____

_

__

Outlier: Work with Extra-Long, or Extra-Short Cycle Time

.

Reflecting on Outlier Stories


_

Backlog Reflect

☹☺

____

_

__

Outlier: Work that was Particularly Pleasant or Unpleasant

.

Possible Actions: Outliers

● Is it a problem/opportunity?● Dig deep (“5 Whys?”) to get from the

proximate cause to the root cause● How might the delay have been mitigated?● Retool &/or Retrain● Definition of Ready issue?

Definition of Done issue?

Development Bottleneck


Step-completed still counts in WIP Limit

Dev (3)Design (3)

Testing Bottleneck


Step-completed still counts in WIP Limit

Dev (3)Design (3)

Design Bottleneck


Possible Actions: Bottlenecks

Note: Occasional bottlenecks are good. They interject welcomed slack time. What you want is a roughly even distribution of slack time across the functions. If not, then ...

● Cross-functional “swarming”● Add manpower● Retool &/or Retrain● (DO NOT just increase WIP Limits)

Recurring Impediments


Impeded

Dev (3)Design (3)

! !

Possible Actions: Impediments

● Revise the Definition of Ready – Don't start the work until you know it won't be impeded that way

● Reassign responsibility for impediment-causing work to the Team (i.e. make the external resource join the team)

● (Rarely) revise the Definition of Done to exclude the impeded work (i.e. pushing responsibility for that part off the Team)

Tracking Cycle Times


Backlog Reflect

Born Begin WIP Done

Cycle Time


Backlog Reflect

Lead Time


Backlog Reflect

Counting Flow


3 1 5 2

Cumulative Flow Diagram

Done

Test

Dev

Design

Actions: Encroaching Channels

This is basically early detection for bottlenecks, so...● (Same actions as Bottlenecks)

Control Chart

X-axis: One column per story completed

Trend line (running average)

Y-axis: Lead time (subtract Begin date from Done date)

Control Charts Compared

Possible Actions: Wavy Trendline

Can the hiccups be explained? If not, then...● Smaller stories● Reduce the WIP limits (yes, reduce)● Attend to impediments● Remove distractions

Take-Aways

All of the various Agile Methodologies attempt to...

1. Eliminate waste. They “Maximize the work not done.”

2. Only provide a framework. You must “Inspect & Adapt”

3. Only illuminate problems. There is no silver bullet.

4. Boost communication. When stakeholders and developers are on the same page, the methodology has done its job.

© Craig L. Jones, 2011-13.All rights reserved.

[email protected]://tech.picsauditing.com

mailto:[email protected]

http://tech.picsauditing.com/

Intro to Agile: Scrum vs. Kanban

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