2. Why even estimate? Why should developers estimate?
3. I'll tell you how I estimate things. I sit down and figure
out how long I think it would take me to do it. Then I double that
time and then I push it up to the next point on the Time
Progression Scale. Were the Time Progress Scale starts off:
seconds, minuets, hours and days. So if I think something is going
to take me 4 hours to do. I will double it to 8 and then I would
say it would take me 8 days to get it all completely done start to
finish. And I'm usually right, because there are so many
impediments. If you are the only one doing it yourself your
schedule can be very accurate. Once you have to involve other
people, you might as well just make numbers up. You might as well
say I think this will take me Blue days to get done
4. Requirements are the key Measure what is measurable, but
make measurable what is not so -Galileo Galilei
5. Wordy Expression Our new contact form for the sales team to
call or email potential leads, will require the potential leads to
provide the following contact information: First and Last name,
Email address, and Phone number
6. Misplaced Modifier The contact form has fields for entering
a valid First and Last Name, Email address and Phone number Top
Tip: Prevent children from ingesting dangerous medicines by locking
them in a childproof cupboard. 3 children per cupboard is a good
fit -Periwinkle Jones @peachesanscream
7. The contact form has fields for First and Last Name, Email
address and Phone number. All fields are required and must be
validated (202) 456-1111 555-1212 212-867-5309 1-800-MATTRES 911
+44 871 984 6352 +852 2280 2898 +91 11 2679 1234 Valid Phone
numbers:
8. fast, rapid, efficient Use a set time: "5 seconds" valid,
including but not limited too, etc., and so on Describe what is
valid or invalid. use comprehensive list maximize, minimize,
optimize, at least, between, several Be sure to include appropriate
values simple, easy, quick, user-friendly Describe what makes it
these reasonable, when necessary How do you make this judgment?
Source: Software Requirements 2 Karl Weigers
9. In order to estimate, you must define the parameters of what
you are estimating: UTF-8 First and Last name must be between 3 and
100 characters Email complies with RFC 822 and no longer than 300
characters Phone Number < 25 characters and validated with
Foo-Bar REST service
10. Historical data Dry run / Unit test Confidence Interval
(CI) It is better to be roughly right than precisely wrong. - John
Maynard Keynes
11. What is the wingspan of a 747 How far is NY from LA The
average house in the United States uses how many gallons/liters of
water per day? Francis Scott Key wrote the lyrics, but not the
music, for the American National Anthem 28 degrees Fahrenheit is
colder than -15 degrees Celsius. America On Line purchased
Netscape.
12. Repetition Pros and Cons Absurdity Test Equivalent Bet
13. 90% WIN 10% Loose
14. Q. What is the wingspan of a 747 A. 211 ft (64m) Q. How far
is NY from LA A. 2,808 mi (4,519 km) Q. The average house in the
United States uses how many gallons/liters of water per day? A. 350
g (1,324 l) Q. Francis Scott Key wrote the lyrics, but not the
music, for the American National Anthem A. True Q. 28 degrees
Fahrenheit is colder than -15 degrees Celsius. A. False Q. America
On Line purchased Netscape. A. True
15. Fuzzy Logic / Tee Shirt Size Average LOC Very Small 127
Small 253 Medium 500 Large 1,014 Very Large 1,988 Source: Software
Estimation 2 Steve McConnell
17. Bayes Theorem P A B = ) () () When you get information, the
level of uncertainty will decrease.
18. Priorities Urgency Matrix Important Not Important Urgent
High Priority Not Urgent Medium Priority Low Priority Source:
Software Requirements 2 Karl Weigers
19. Priorities Prioritization Spreadsheet Source: Software
Requirements 2 Karl Weigers
https://www.microsoftpressstore.com/store/software-requirements-9780735679665
Feature Relative Benefit Relative Penalty Total Value Value % Dev
Cost Cost % Dev Risk Risk % Priority Validate Phone 2 4 8 13.1 1
9.1 1 14.3 0.81 Mark off for contacted leads 5 3 13 21.3 2 18.2 1
14.3 0.84 Report on Data 9 7 25 41.0 5 45.5 3 42.9 0.61 Connect to
Service 5 5 15 24.6 3 27.3 2 28.6 0.59 Totals 21 19 61 100.0 11
100.0 7 100.0
20. Politics Remove people from the problem Focus on Interests
not Positions DO NOT NEGOTIATE YOUR ESTIMATE!!!!!
21. Final Thoughts Prefer hours to days (scale easier) Throwing
more developers may not solve the problem Iterate and be
honest
22. ISBN-13: 978-0735618794
23. ISBN-13: 978-0735605350
24. ISBN-13: 978-1118539279
25. Questions?
26. Thank You! Chuck Reeves @manchuck https://joind.in/11229
Software Estimation: Demystifying the Black Art by Steve McConnell
| ISBN-13: 978-0735605350 Software Requirements: Practical
Techniques for Gathering and Managing Requirements by Karl Wiegers
How to Measure Anything: Finding the Value of Intangibles in
Business by Douglas Hubbard | ISBN-13: 978-1118539279 Dev Hell
Podcast - Episode 29: Snappy Answers to Stupid Questions