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Experiencing Agility From Requirements to Planning
1.
Experiencing Agility: From Requirements
to Planning November 10, 2008 Mike Cohn 1
2.
® © 2003–2008
Mountain Goat Software® Founding member and director of Agile Alliance and Scrum AllianceFounder of Mountain Goat Software Ran my first Scrumproject back in 1995Typical programmer to manager etc. progression Mike Cohn - background Agile coachand trainer 2
3.
® © 2003–2008
Mountain Goat Software® Course agenda User stories and the product backlog Estimating product backlog items Release planning The boss wants it all The boss wants it in 8 weeks Agenda 3
4.
® © 2003–2008
Mountain Goat Software® User Stories On the Product Backlog 4
5.
® © 2003–2008
Mountain Goat Software® The product backlog The requirements A list of all desired work on the project Ideally expressed such that each item has value to the users or customers of the product Prioritized by the product owner Reprioritized at the start of each iteration 5
6.
® © 2003–2008
Mountain Goat Software® A sample product backlog Backlog item Estimate Allow a guest to make a reservation 3 As a guest, I want to cancel a reservation. 5 As a guest, I want to change the dates of a reservation. 3 As a hotel employee, I can run RevPAR reports (revenue-per-available-room) 8 Improve exception handling 8 ... 30 ... 50 6
7.
® © 2003–2008
Mountain Goat Software® Sample user stories As an account holder, I want to check my savings account balance. As an account holder, I am required to authenticate myself before using the system. As the primary account holder, I can grant access to additional users so that they can see transactions. 7
8.
® © 2003–2008
Mountain Goat Software® Non-functional user stories As one of 10,000 concurrent users, I would like the system to perform adequately. As a first-time user, I can complete common operations without using the help system. 8
9.
® © 2003–2008
Mountain Goat Software® The product backlog iceberg Sprint Release Future Releases Priority 9
10.
® © 2003–2008
Mountain Goat Software® Stories,themes and epics User Story A description of desired functionality told from the perspective of the user or customer. Theme A collection of related user stories. Epic A large user story. 10
11.
® © 2003–2008
Mountain Goat Software® An example As aVP Marketing, I want to review the performance of historical promotional campaigns so that I can ones. As aVP Marketing, I want to select the timeframe to use when reviewing the performance of past promotional campaigns, so that I can identify and repeat As aVP Marketing, I can select which type of campaigns (direct mail,TV, email, radio, etc.) to include when reviewing the performance of historical promotional campaigns. Clearly an epic Epics?? 11
12.
® © 2003–2008
Mountain Goat Software® An example As aVP Marketing, I want to see information on direct mailings when reviewing historical campaigns. As aVP Marketing, I want to see information on television advertising when reviewing historical campaigns. As aVP Marketing, I want to see information on email advertising when reviewing historical campaigns. 12
13.
® © 2003–2008
Mountain Goat Software® Conditions of Satisfaction Added when story is small and is ready to be worked on These are essentially tests As a VP Marketing, I want to see information on television advertising when reviewing historical campaigns. Number of viewers by age range Number of viewers by income level 13
14.
® © 2003–2008
Mountain Goat Software® Story-writing workshops Includes developers, users, customer, others Brainstorm to generate stories Goal is to write as many stories as possible Some will be “implementation ready” Others will be “epics” No prioritization at this point 14
15.
® © 2003–2008
Mountain Goat Software® Start with epics and iterate As a product owner, I can work with multiple projects. As a product owner, I can see various reports. Product owner As a product owner, I can add, edit and delete backlog items. As a product owner, I can sort the product backlog. As a product owner, I can split a large item into many smaller items. As a product owner, I can manage the product backlog. 15
16.
® © 2003–2008
Mountain Goat Software® ProductVision Your new company, AgileTool Builders, is considering developing a tool for agile teams to use in managing their product and iteration backlogs. Use this template “As a <user role>, I want <goal> so that <reason>.” 1.Identify the main users of such a tool. 2.Write 20 or so epic user stories covering the breadth of functionality you anticipate in the product. An example: As the product owner, I can manage the product backlog. 16
17.
® © 2003–2008
Mountain Goat Software® Estimating the Initial Product Backlog 17
18.
® © 2003–2008
Mountain Goat Software® How long will it take... ...to read the latest Harry Potter book? ...to drive to Minneapolis? 18
19.
® © 2003–2008
Mountain Goat Software® Estimate size; derive duration Size Calculation Duration 300 kilograms Velocity= 20 300/20 = 15 sprints 19
20.
® © 2003–2008
Mountain Goat Software® Story points The “bigness” of a task How hard it is How much of it there is Relative values are what is important: A login screen is a 2. A search feature is an 8. Points are unit-less As a user, I want to be able to have some but not all items in my cart gift wrapped. 5 20
21.
® © 2003–2008
Mountain Goat Software® An example Story Points Done As the site editor, I can add an article to the site. 5 ✔ As a site visitor, I want to read a new article on the front page about once a week. 5 ✔ As the site editor, I can include a teaser with each article. 3 As a site member who has read a teaser on the front page, I want to read the entire article. 2 As a site visitor, I can do a full-text search of article body, title, and author name. 13 As a site visitor, I can subscribe to an RSS feed of articles. 5 As a site visitor, I can post comments about articles so that others can read them. 13 21
22.
® © 2003–2008
Mountain Goat Software® Triangulation multiple other stories. Group like-sized stories together Story A 1 pt 2 pts 3 pts Story C Story D Story F Story B Story E 22
23.
® © 2003–2008
Mountain Goat Software® Use the right units Can you distinguish a 1-point story from a 2? Can you distinguish a 17 from an 18? Use units that make sense, such as 1, 2, 3, 5, 8, 13 Stay mostly in a 1-10 range Include 0 and ½ if you want , 20, 40, 100 23
24.
® © 2003–2008
Mountain Goat Software® Planning poker An iterative approach to estimating Steps Each estimator is given a deck of cards, each card has a valid estimate written on it Customer/Product owner reads a story and it’s discussed Each estimator selects a card that’s his or her estimate Cards are turned over so all can see them Discuss differences (especially outliers) Re-estimate until estimates converge 24
25.
® © 2003–2008
Mountain Goat Software® Planning poker - an example Estimator Round 1 Vadim 8 Susan 3 Ann 2 Chris 5 Round 2 5 5 5 8 25
26.
® © 2003–2008
Mountain Goat Software® Estimate these Product backlog item Estimate Remove, sand, re-paint the cabinets. Replace tile countertop with granite. Repaint entire kitchen. Lay shelf paper. Install recessed lighting. Install built-in refrigerator. Replace existing oven with a new one. Run a water line to existing island and add a sink. Replace existing simple window with a bay window. 26
27.
® © 2003–2008
Mountain Goat Software® www.planningpoker.com Free, or I wouldn’t mention it 27
28.
® © 2003–2008
Mountain Goat Software® Release Planning 28
29.
® © 2003–2008
Mountain Goat Software® Release planning To answer questions such as: How much will be done by June 30? When can we ship with this set of features? How many people or teams should be on this project? Purpose Usually covers a 3-6 month horizon Useful even on shorter projects Helps iterations combine into something more useful Very long projects can be split into multiple milestones 29
30.
® © 2003–2008
Mountain Goat Software® Two sample release plans By June, we’ll here and there To get this much done will take until June or July Fixed scopeFixed date 30
31.
® © 2003–2008
Mountain Goat Software® Velocity A useful long-term measure of the amount of work completed per sprint Not a prediction of exactly how much work will be completed in each sprint 0 10 20 30 40 1 2 3 4 5 6 7 8 9 Sprints Velocity is measured in the units you use to estimate product backlog items StoryPoints 31
32.
® © 2003–2008
Mountain Goat Software® Velocity is best expressed as a range 0 10 20 30 40 1 2 3 4 5 6 7 8 9 Sprints Mean (Worst 3) = 28 Mean (Last 8) = 33 Mean (Best 3) = 37 32
33.
® © 2003–2008
Mountain Goat Software® Use each subsequent column as the number of story points to assign a product backlog item Month EEstimmates in Sttory PPointss 1 50 10 70 70 90 70 80 90 80 40 50 70 10 30 50 80 70 100 40 70 20 90 40 80 80 2 40 60 80 10 40 20 40 10 40 40 50 30 80 20 50 90 90 90 50 70 10 10 30 60 30 3 100 90 60 40 100 40 60 50 60 30 40 70 30 30 30 40 70 10 40 60 80 40 70 40 100 4 100 40 40 100 20 40 70 90 20 10 100 100 70 90 50 60 70 20 100 60 30 60 20 80 10 5 10 30 30 10 10 60 10 60 40 70 80 20 30 50 90 90 90 60 40 80 60 10 20 80 60 6 90 80 70 80 30 90 70 20 70 100 70 50 80 100 10 40 100 50 100 60 10 40 20 70 60 7 100 70 50 60 30 50 50 30 30 60 60 40 40 50 10 60 40 70 50 10 20 100 40 100 70 8 70 10 10 80 10 50 20 30 100 50 40 80 50 80 20 40 70 70 10 80 60 80 90 10 50 9 30 90 20 20 70 20 20 10 60 90 20 40 40 40 90 90 80 10 70 30 40 10 80 40 40 10 30 60 60 80 100 40 70 50 10 20 90 40 20 80 20 80 70 30 10 80 80 20 90 10 40 11 50 100 10 90 30 30 30 30 40 70 60 80 60 70 40 20 100 80 90 80 10 70 60 90 100 12 70 10 60 50 100 80 70 40 90 70 50 100 30 90 50 40 10 100 60 40 50 20 40 80 50 Estimating your backlog 33
34.
® © 2003–2008
Mountain Goat Software® Use a different team member’s month of birth Use each subsequent column as the team’s velocity for one iteration Month Iterattions Month 1 2 3 4 5 6 7 8 1 70 80 100 100 80 140 90 90 2 100 80 100 90 110 90 100 80 3 120 120 120 30 100 110 50 140 4 70 80 90 100 110 120 130 140 5 140 130 120 110 100 90 80 70 6 100 100 80 70 130 110 90 80 7 70 80 100 100 80 140 90 90 8 100 80 100 90 110 90 100 80 9 120 120 120 30 100 110 50 140 10 70 80 90 100 110 120 130 140 11 140 130 120 110 100 90 80 70 12 100 100 80 70 130 110 90 80 Your last 8 velocities 34
35.
® © 2003–2008
Mountain Goat Software® Fixed-scope planning 1. Sum all the backlog items the customer needs 2. Measure or estimate velocity as a range 3. Divide total story points by high velocity This is the shortest number of iterations it could take 4. Divide total story points by low velocity This is the “most” iterations it could take When will all of this be done? 35
36.
® © 2003–2008
Mountain Goat Software® Fixed-scope planning : an example Total story points desired 120 Low velocity 15 High velocity 20 120÷20= 120÷15= 36
37.
® © 2003–2008
Mountain Goat Software® Fixed-scope commitments It’s a risk issue Where do you want to be? If you write a contract for to the long duration: You’ll probably won’t win the contract But you’ll make money if you do If you write a contract for to the short duration: You’ll probably win the contract But you may not make money 37
38.
® © 2003–2008
Mountain Goat Software® Selling the overall plan You wrote epic user stories to span the overall system functionality. You had the team estimate these. You know your team’s past velocities. ? Your boss wants to know how long it will take to “get it all.” You’ll still build the system incrementally, but knowing the total size is helpful for the initial go / no-go decision Tip: Give the boss a range of iterations. 38
39.
® © 2003–2008
Mountain Goat Software® Bonus Question If I told you that the last project was 500 story points and cost $1,500,00 to deliver, what is a rough estimate of the cost of the new project? ? 39
40.
® © 2003–2008
Mountain Goat Software® Fixed-date planning 1. Determine how many iterations you have 2. Measure or estimate velocity as a range 3. Multiply low velocity × number of iterations Count off that many points These are “Will Have” items 4. Multiply high velocity × number of iterations Count off that many more points These are “Might Have items” How much can I get by <date>? 40
41.
® © 2003–2008
Mountain Goat Software® Fixed-date planning : an example Desired release date 30 June Today’s Date 1 January Number of iterations 6 (monthly) Low velocity 15 High velocity 20 6×15 6×20 Will have Might have Won’t have 41
42.
® © 2003–2008
Mountain Goat Software® Fixed-date contracting 6×15 6×20 Will have Might have Won’t have You won’t likely win the contract But you’ll probably make money if you do If you write a contract for just the will haves: You will likely win the contract But probably not make money on it If you write a contract that includes the might haves: It’s a risk issue Where do you want to be? 42
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® © 2003–2008
Mountain Goat Software® The impending trade show Now the boss needs a new version for the big trade show that is 4 iterations away. Which features can you “guarantee” will be in for the trade show? Which features are likely to be in? Use the following user stories and estimates 43
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® © 2003–2008
Mountain Goat Software® Past velocities Historrical Data Iteration number Velocity 1 20 2 14 3 23 4 18 5 25 6 30 7 12 8 22 9 15 10 23 Your Esstimates Low Average High 44
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Mountain Goat Software® The team’s estimates Product backlog item Estimate As the product owner I want to drag items onto a release burndown chart and see the impact to the release date. 20 As a user at a company with lots of cash, I want your product to support touch screens so I can put a large one in our team room. 13 As a user I would like performance to be about twice as fast as now during peak use periods. 20 As a team member, I’d like to be able to do online planning poker estimating right inside the tool. 13 As a third party, I would like an SOA interface so that I can integrate my product with yours. 8 As a team member I want RSS support for all changes to tasks or user 8 As the product downer, I want a new report that shows differences in the product backlog between different time periods. 3 of different stories so that I can reuse them 13 45
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® © 2003–2008
Mountain Goat Software® Mike Cohn mike@mountaingoatsoftware.com www.mountaingoatsoftware.com (720) 890− (303) 810−2190 (mobile) 46
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