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Kevlin Henney, profile picture
Uploaded byKevlin Henney
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Agility ≠ Speed

The document discusses the distinction between agility and speed, emphasizing factors like team dynamics, diverse backgrounds, and collective intelligence in effective group work. It highlights various methodologies for decision-making and iterative processes, such as Boyd's OODA loop and Deming's cycle. Additionally, the text critiques traditional software development models, asserting that development often suffers from diseconomies of scale and emphasizing the need for adaptive communication structures in design efforts.

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Agility ≠ Speed @KevlinHenney
agile, adjective ▪ able to move quickly and easily Concise Oxford English Dictionary
agile, adjective ▪ able to move quickly Concise Oxford English Dictionary
I have made this [letter] longer than usual because I have not had time to make it shorter. Blaise Pascal
Je n'ai fait celle-ci plus longue que parce que je n'ai pas eu le loisir de la faire plus courte. Blaise Pascal
I have made this [letter] longer than usual because I have not had time to make it shorter. Blaise Pascal
time
I spent a lot of money on booze, birds and fast cars. The rest I just squandered. George Best
https://twitter.com/KevlinHenney/status/922803893167427584
Move fast and break things
speed
velocity
v = vx + vy
v = |v|
v = s'
v = ds dt __
v = s t _
t s
t s
t s [T] [T]
utilisation
quality of estimation
Observe Gather information from a range of sources Orient Understand where you're at and where you want to be Decide Develop a plan for action Act Carry out the plan Boyd's OODA Loop
Decide Develop a plan for action Act Carry out the plan Observe Gather information from a range of sources Orient Understand where you're at and where you want to be Boyd's OODA Loop
Plan Establish hypothesis, goal or work tasks Do Carry out the plan Study Review what has been done against plan (a.k.a. Check) Act Revise approach or artefacts based on study Deming/Shewhart Cycle
The design process is an iterative one. Andy Kinslow
You have to finish things — that's what you learn from, you learn by finishing things. Neil Gaiman
code tests scripts
codified knowledge
knowledge acquisition
learning
communication
social negotiation
model of participation
The biggest advantage of autonomously working teams is risk reduction through increased group intelligence. Kevlin Henney https://jaxlondon.com/blog/java-core-languages/the-error-of-our-ways-kevlin-henney/
There’s little correlation between a group’s collective intelligence and the IQs of its individual members. But if a group includes more women, its collective intelligence rises. "What Makes a Team Smarter? More Women" Anita Woolley & Thomas W Malone http://hbr.org/2011/06/defend-your-research-what-makes-a-team-smarter-more-women/
People from diverse backgrounds might actually alter the behavior of a group’s social majority in ways that lead to improved and more accurate group thinking. "Why Diverse Teams Are Smarter" David Rock & Heidi Grant https://hbr.org/2016/11/why-diverse-teams-are-smarter
Diverse teams are more likely to constantly reexamine facts and remain objective. "Why Diverse Teams Are Smarter" David Rock & Heidi Grant https://hbr.org/2016/11/why-diverse-teams-are-smarter
The four conditions that characterize wise crowds: diversity of opinion, independence, decentralization, and aggregation.
speed
size
scale
Software development does not have economies of scale. Development has diseconomies of scale. Allan Kelly Beyond Projects http://www.slideshare.net/allankellynet/no-prokects-beyond-projects-refreshed-version
completion time for one person 𝑡 = 𝑡1
division of labour 𝑡 = 𝑡1 𝑛
𝑡 = 𝑡1 1 − 𝑝 𝑛 − 1 𝑛 portion in parallel Amdahl's law
communication overhead (typical) connections (worst case) 𝑡 = 𝑡1 1 − 𝑝 𝑛 − 1 𝑛 + 𝑘 𝑛 𝑛 − 1 2
𝑡 = 𝑡1 1 − 𝑝 𝑛 − 1 𝑛 + 𝑘 𝑛 𝑛 − 1 2t n
The Facebook iOS app has over 18,000 Objective-C classes, and in a single week 429 people contributing to it. Facebook's code quality problem Graham King http://www.darkcoding.net/software/facebooks-code-quality-problem/
For every activity there is a certain appropriate scale.
Your customers do not buy your software by the line. David Evans
We may therefore picture the process of form-making as the action of a series of subsystems, all interlinked, yet sufficiently free of one another to adjust independently in a feasible amount of time. Christopher Alexander Notes on the Synthesis of Form
It works, because the cycles of correction and recorrection, which occur during adaptation, are restricted to one subsystem at a time. Christopher Alexander Notes on the Synthesis of Form
The basic thesis [...] is that organizations which design systems [...] are constrained to produce designs which are copies of the communication structures of these organizations. Melvin Conway How Do Committees Invent?
We have seen that this fact has important implications for the management of system design. [...] A design effort should be organized according to the need for communication. Melvin Conway How Do Committees Invent?
thrustdrag liftgravity
designdebt practiceconway
F = ma
µονόλιθος
Why do cars have brakes?
Cars have brakes so you can slow down.
Cars have brakes so you can go fast.
Agility ≠ Speed