agile estimation and planning
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An Introduction to Agile Estimation and
Release PlanningPhillip Calçado
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Agile Estimation
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1 - Product Backlog
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2 - Estimate Each Item
How long is this going to take?
-1 day?-1 week?-Forever?
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Is likely to take longer than ?
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2 - Estimate Each ItemThoughtWorks
#1
#2
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How much longer?
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?
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?=
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How much longer?
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?= ☑
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Let’s create a unitThoughtWorks
#1 = 2
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Let’s create a unit
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#2 =
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#1 = 26
then
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6 4
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2 - Estimate Each Item
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2 - Estimate Each Item•Stories will change•Everyone estimates•Points aren’t a unit of time•Being consistent is more important than being accurate•Estimates must include uncertainty
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3 - Prioritise
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3 - Prioritise
$$$
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3 - PrioritiseThoughtWorks
2$$$
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6 $
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6 $$
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3 - Prioritise•It is important to help the client prioritise•But the client has the final word•Technical dependencies are relevant•Priorities will change over time
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4 - Assess Velocity
Points = EffortDuration = ?
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Iteration 1 Iteration 2 Iteration 3 Iteration 4 Iteration 5 Iteration 6
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Iteration 1 Iteration 2 Iteration 3 Iteration 4 Iteration 5 Iteration 6
8 10 14 14 14 18
Velocity
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4 - Assess Velocity
What’s our average Velocity likely to be?
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4 - Assess Velocity•Planned Velocity is useful only until we have real data - just an educated guess•“Yesterday’s weather” is more important than average•Iterations must create production-quality increments•Velocity is specific for a team
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Say planned Velocity is 6
5 - Candidate Schedule
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5 - Candidate Schedule
Backlog is points total34
Say planned Velocity is 6
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/ 6= Iterations34 6
5 - Candidate Schedule
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Iteration 1 Iteration 2 Iteration 3 Iteration 4 Iteration 5 Iteration 6
5 - Candidate ScheduleThoughtWorks
2$$$
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6$$
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6$
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4$
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5 - Candidate Schedule•Ramp-up time usually has a huge impact•Pay attention to cost/scope/time constraints•Aim at delivering early and often
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6 - Monitor and Adapt
Plans are not that important.Planning is.
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6 - Monitor and Adapt
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Start 1 2 3 4 5 6 7 8 9
Poin
ts
Iteration
Original Plan Actual Total Scope
Real World Example
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6 - Monitor and Adapt•You can’t embrace change and have a plan written in stone•Re-estimate whenever necessary•Don’t try and force real life to look like your plan - It’s the other way around
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Concluding•This is just a framework - there are multiple variants•The customer is a partner during estimation and planning•Don’t try to change the world, change your plan