1.
How and why to design your teams
for modern software systems
Matthew Skelton | Skelton Thatcher Consulting
@matthewpskelton | skeltonthatcher.com
DevOpsCon Berlin / @devops_con / #devopscon
13 June 2017, Berlin, DE

2.
Today
•Conway’s Law (or heuristic)
•Cognitive Load for teams
•Real-world Team Topologies
•Guidelines for team design

3.
About me
Matthew Skelton
@matthewpskelton
Co-founder at
Skelton Thatcher Consulting
skeltonthatcher.com

4.
Organisation design for effective software systems
Tutorial / Workshop
Weds 27 Sept 2017, London
https://ti.to/skelton-thatcher-consulting/organisation-design-workshop-sept-2017
skeltonthatcher.com
“DEVOPS25"
for 25%
discount

5.
Books

6.
Team-first digital transformation
30+ organisations
UK, US, DE, India, China
skeltonthatcher.com

7.
How and why to
design your teams
for modern software
systems

8.
Safer, more rapid
changes to
software systems
(Business Agility)

9.
TEAM

10.
TEAM
capabilities
appetite & aptitude
understanding
responsibilities

11.
(assumption)
the team is stable, slowly changing,
and long-lived
#NoProjects

12.
Conway’s Law
(or Conway’s Heuristic)

13.
“organizations which design
systems ... are constrained to
produce designs which are copies
of the communication structures of
these organizations”
– Mel Conway, 1968
http://www.melconway.com/Home/Conways_Law.html

14.
“if the architecture of the system and
the architecture of the organization
are at odds, the architecture of the
organization wins”
– Ruth Malan, 2008
http://traceinthesand.com/blog/2008/02/13/conways-law/

15.
“We find strong evidence to support
the hypothesis that a product’s
architecture tends to mirror the
structure of the organization in
which it is developed.”
– MacCormack et al, 2012
MacCormack, Alan, Carliss Y. Baldwin, and John Rusnak. ‘Exploring the Duality Between Product and Organizational Architectures: A Test of the
“Mirroring” Hypothesis’, 1 October 2012. http://www.hbs.edu/faculty/Pages/item.aspx?num=43260.

16.
homomorphic force
(#Conway  #Yawnoc)
HT @allankellynet
(same) (shape)

17.
Front-end
developers
Back-end
developers

18.
‘Reverse Conway’
Tobbe Gyllebring (@drunkcod)

19.
A
B
A B

20.
Design the
organisation architecture
to produce the right
software architecture

21.
Cognitive Load
for teams

22.
Cognitive load
the total amount of
mental effort being used in
the working memory
(see Sweller, 1988)

23.
Cognitive load
Intrinsic
Extraneous (Irrelevant )
Germane (Relevant)

24.
‘Hacking Your Head’: Jo Pearce
See http://www.slideshare.net/JoPearce5/hacking-your-head-managing-information-overload-45-mix
@jdpearce

25.
We have SCIENCE!

26.
Science since 1988
• Driskell et al, 1999 ‘Does Stress Lead to a Loss of Team Perspective?’ Group Dynamics:
Theory, Research, and Practice 3, no. 4 (1999): 291.
• Fan et al, 2010 ‘Learning HMM-Based Cognitive Load Models for Supporting Human-Agent
Teamwork’. Cognitive Systems Research 11, no. 1 (2010): 108–119.
• Ilgen & Hollenbeck, 1993 ‘Effective Team Performance under Stress and Normal Conditions:
An Experimental Paradigm, Theory and Data for Studying Team Decision Making in
Hierarchical Teams with Distributed Expertise’. DTIC Document, 1993.
• Johnston et al, 2002 ‘Application of Cognitive Load Theory to Developing a Measure of Team
Decision Efficiency’. DTIC Document, 2002.
• Sweller, John, 1994 ‘Cognitive Load Theory, Learning Difficulty, and Instructional Design’.
Learning and Instruction 4 (1994): 295–312.
• Sweller, John, 1988. ‘Cognitive Load during Problem Solving: Effects on Learning’. Cognitive
Science 12, no. 2 (1988): 257–285.

27.
“stress impacts team
performance … by narrowing or
weakening the team-level
perspective required for
effective team behavior.”
– Driskell et al, 1999
Group Dynamics: Theory, Research, and Practice 1999, Vol. 3, No. 4,291-302

28.
(not just ‘pop’ science!)

29.
High-performing teams are
hugely effective
Optimise for the team

30.
Match the team
responsibility to the
cognitive load that
the team can handle

31.
Real-world
Team Topologies

32.
DevOpsTopologies.com

33.
Development & Testing
IT Operations / Web Operations
Anti-Type
Database / DBA
DevOps activity
SRE
Component
Supporting (Tooling / Platform / Build)

34.
(Can you spot an important
team type that is missing?)

35.
Anti-Types

36.
Anti-Type A – Separate Silos
devopstopologies.com
Dev Ops

37.
Anti-Type B – Separate DevOps Silo
Dev OpsDevOps
devopstopologies.com

38.
devopstopologies.com
Dev OpsDevOps
Anti-Type C – “We Don’t Need Ops”

39.
Anti-Type D – ‘DevOps’ as another Dev team
devopstopologies.com
Dev Ops
DevOps

40.
Anti-Type E – DevOps as new SysAdmin team
devopstopologies.com
Dev OpsDevOps

41.
Anti-Type F – Ops embedded in a Dev Team
HT: Matt Franz (@seclectech)
devopstopologies.com
Dev
Ops
DevOps

42.
Anti-Type G – Dev-DBA gap!
devopstopologies.com
Dev OpsDBA

43.
Types

44.
Type 1 – Smooth Collaboration
devopstopologies.com
Dev OpsDevOps

45.
Type 2 – Fully Embedded
devopstopologies.com
Dev Ops

46.
devopstopologies.com
Dev OpsDevOps
Type 3 – Infrastructure-as-a-Service

47.
Type 4 – DevOps-as-a-Service
devopstopologies.com
Dev OpsDevOps

48.
devopstopologies.com
Dev OpsDevOps
Type 5 – Temporary DevOps Team

49.
devopstopologies.com
Dev OpsDevOps
Type 6 – ‘Facilitating’ DevOps Team

50.
Type 7 – SRE Team (Google)
SRE
HT: @kwdhinde
devopstopologies.com
Dev OpsDevOps

51.
HT: @jascbu
devopstopologies.com
Dev OpsDevOps
Type 8 – ‘Just run my Containers’

52.
Type 9 – DB capability in Dev
DBADB Dev
devopstopologies.com
Dev OpsDevOps

53.
Type 10 – DB as a Service
DBaaSDB Dev
devopstopologies.com
Dev OpsDevOps

54.
There is no single ‘right’ team
topology, but several ‘bad’
topologies for any one
organisation

55.
Guidelines for
team design

56.
Collaboration vs X-as-a-Service
Collaboration X-as-a-Service
devopstopologies.com

57.
Collaboration vs X-as-a-Service
Collaboration X-as-a-Service
devopstopologies.com
Rapid discovery
No hand-offs
Comms overheads?
Ownership clarity
Less context needed
Slower innovation?

58.
Supporting & Business Domain
Supporting Business Domain
devopstopologies.com

59.
Inner Topologies
Collaboration XaaS
Within any group there may be
internal collaborations AND other X-
as-a-Service (XaaS) relationships
devopstopologies.com

60.
Team types
Component team
Platform / ’substrate’ team
Supporting / ‘productivity’ team
Product/Feature team
devopstopologies.com

61.
Team configuration
devopstopologies.com
Platform / ’substrate’ team
Product/Feature team

62.
Team configuration
Component team
Platform / ’substrate’ team
Product/Feature team
devopstopologies.com

63.
Team configuration
Component team
Platform / ’substrate’ team
Product/Feature team
Supporting / ‘productivity’ team
devopstopologies.com

64.
Discovery vs. Predictability
Team 1
Team 2
Team N
Discovery, rapid learning
Predictable delivery
devopstopologies.com

65.
Established platform (PaaS)
Predictable delivery
devopstopologies.com

66.
Evolution of team topologies
devopstopologies.com
DISCOVER ESTABLISH

67.
Evolution of team topologies
Team 2
Discover Discover
Team N
Team 3
Use
Use
devopstopologies.com
Team 1
Establish
Establish
…

68.
Evolve different team
topologies for different parts of
the organisation at different
times to match the team
purpose and context

69.
Summary

70.
Front-end
developers
Back-end
developers
A
B
A B

71.
Design the
organisation architecture
to produce the right software
architecture

72.
“stress impacts team
performance … by narrowing or
weakening the team-level
perspective required for
effective team behavior.”
– Driskell et al, 1999
Group Dynamics: Theory, Research, and Practice 1999, Vol. 3, No. 4,291-302

73.
Match the team responsibility
to the cognitive load that the
team can handle

74.
DevOpsTopologies.com

75.
There is no single ‘right’ team
topology, but several ‘bad’
topologies for any one
organisation

76.
Team configuration
Component team
Platform / ’substrate’ team
Product/Feature team
Supporting / ‘productivity’ team
devopstopologies.com

77.
Evolution of team topologies
Team 2
Discover Discover
Team N
Team 3
Use
Use
devopstopologies.com
Team 1
Establish
Establish
…

78.
Evolve different team
topologies for different parts of
the organisation at different
times to match the team
purpose and context

79.
Caution

80.
Team topologies
alone will not
produce effective
software systems

81.
Also needed:
culture, good engineering,
sane funding models,
clarity of business vision

82.
Safer, more rapid
changes to
software systems
(Business Agility)

83.
teamtopologies.com
Upcoming book:
Team Topologies for
effective software systems
by Matthew Skelton & Manuel Pais

84.
Organisation design for effective software systems
Tutorial / Workshop
Weds 27 Sept 2017, London
https://ti.to/skelton-thatcher-consulting/organisation-design-workshop-sept-2017
skeltonthatcher.com
“DEVOPS25"
for 25%
discount

85.
thank you
Matthew Skelton & Manuel Pais
@SkeltonThatcher
skeltonthatcher.com