Estimations in Scrum can involve several techniques including the Wideband Delphi Method, Planning Poker, and reaching consensus. Planning Poker involves discussing a task, selecting an estimation card with a number, debating proposals, reselecting a card until consensus is reached. Attributes to consider include biased opinions, the Dunning-Kruger effect, expertise of individuals, and whether to use relative or real units. Reaching consensus may take up to three rounds and on the third round either pick the biggest number or take the majority. Best practices include estimating effort not time, limiting discussion of implementation details, starting with user stories, and following priorities in the product roadmap.

1. Deep Dive
ESTIMATIONS IN
SCRUM

2. ROOTS - WIDEBAND DELPHI METHOD
Experts are getting specifications
Discussion happens
Every expert fills the form anonymously
Discussion happens about why estimations vary
Every expert fills the form anonymously
repeat

3. PLANNING POKER
Discuss the task
Pick a card with a number
Give min and max proposals a soapbox time
Pick a card again
Repeat until a consensus is reached
Record a number

4. ATTRIBUTES OF A PLANNING POKER
Biased opinions
Dunning-Kruger effect
All are the experts in their field of knowledge
Relative estimations or real units estimation (days vs
story points or t-shirt sizes)
Repeat until a consensus is reached
Share knowledge and cover dark corners is the goal, not
number itself
numbers can help to make forecasts

5. BIASED OPINIONS

6. That's normal!
We work as a Team because only together we know
everything
Cross experts communication is key. e.g. PO -> DevTeam,
UI/UX -> PO
lack of expertise does not make your opinion less
valuable
place to talk about the scope to align everyone
Chinese whispers effect minimized

7. DUNNING-KRUGER EFFECT
"If you're incompetent, you can’t know
you’re incompetent. The skills you need to
produce a right answer are exactly the skills
you need to recognize what a right answer
is."

8. ALL ARE THE EXPERTS IN THEIR FIELD OF
KNOWLEDGE
You know something I don't
You share your knowlege. Now everyone knows it
...
Profit!

9. RELATIVE OR REAL UNITS ESTIMATION
Hours
Days
Ideal Days/Hours
Story Points
T-Shirt sizes
Parrots, carrots, bottle of beers, anything goes

10. A WORD ON UNITS
Beginners tend to use t-shirts, ideal days and such
Mature teams can easily juggle with story points
Story point is super relative, ideal day is very natural

11. Yes, it is tough!
REACHING CONSENSUS
but "Discussio mater veritas est." some
Latin dude said that
Repeat conversation until full consensus
Keep up to 3 rounds
On 3rd - pick one biggest
or On 3rd - take number by majority

12. HOW DO WE ESTIMATE AND WHAT IS A BEST
PRACTICE?
Best Practice We
As a
customer, I
want see my
orders so that
I can figure
out what I
bought.
... has provided an endpoint which
allows for enabling/disabling support to
users by providing a list of Subscription
assignid's, as opposed to the current
endpoint which only accepts one
assignid.

13. Best Practice We
estimate effort not
time
estimate effort not time
minimal
implementation
sometimes we try to get bigger,
better, more complex
one whole thing -
full nine yard
5 cards = 1x Mockups, 2x
Investigation, 2x Implementation

14. Best Practice We
severely limit
implementation talks
we tend to talk about
implementation a lot

15. IDEAS
Reject card with no acceptance criteria!
Start writing user stories! (bugs can skip that)
Define personas, grow attached to them
Discuss user story instead of lifeless card at grooming
Keep implementation in planning
Estimate minimum implementation. Enough is enough
On 3rd round pick a maximum instead of majority
Do not estimate task items. Only story itself
Use coffee break card if you want!
Follow the roadmap. That is our short-term goal
definition. Is that card is about our current priorities?

16. Dra agenda:
CUSTOMER INSIGHTS WORKSHOP
Prework: research on the topic to get yourself prepared
Day 1: Announce topics to work on, split into groups
Day 2: Work on presentations on the chosen matter
Day 2: Evening: present material on chosen topics
Day 3: Prepare card for grooming for the next steps