際際滷

際際滷Share a Scribd company logo
WHEN
NUMBERS
ARETRICKY
Anna Jozanis
Designers point of view on data
When numbers are tricky
DATA-DRIVEN
DATA-DRIVEN
EVERYTHING
TOO MUCHTRUST
Test name: Result: Reference range: Unit:
9,50 <7,8 mmol/lBlood glucose
(1 hour after glucose load)
DATA IS
NOT ENOUGH
?QUESTIONS
The designers most
important tool is
the question.
ERIKA HALL
.
TRUST
Add to cart
Summary
Delivery form
Go to checkout
Purchase
DESKTOP MOBILE WEB
disclaimer:All data in the presentation is fake and used only to demonstrate the topic.
Add to cart
Summary
Delivery form
Go to checkout
Purchase
disclaimer:All data in the presentation is fake and used only to demonstrate the topic.
Add
to
cart
Summary
Delivery form
Go
to
checkout
Purchase
Log in
Add to cart
to buy now
for later
to buy in
a different channel
Add to cart Log in
to buy now
for later
to buy in
a different channel
saving password
resetting password
guest checkout
DATA
lower mobile conversion rates
RESEARCH
switching channels
forgetting passwords
mobile laziness
You cant interpret
data correctly without
understanding
the story behind it.
A B
Home
Purchase Con鍖rmation
Offer Page
Listing
Delivery Form
Purchase
A B
disclaimer:All data in the presentation is fake and used only to demonstrate the topic.
disclaimer:All data in the presentation is fake and used only to demonstrate the topic.
Home
Purchase Con鍖rmation
Offer Page
Listing
Delivery Form
Purchase
NEW OFFER PAGE
1
2
10
9
3 5
4 6
7
8
DELIVERY
COST
OLD OFFER PAGE
1
2
9
3 5
4 6
7
8
10
DELIVERY COST
PURCHASE CONFIRMATION
1
2
9
3
4
7
10
DELIVERY COST
Offer page performs better
RESEARCH
People cant 鍖nd all details
on offer page
People abandon checkout
DATA
Dont stop exploring
whats beneath the data
even if it looks like
you did a good job.
Good designers want
to be proved wrong,
bad designers hope
to be proved right.
ANDY BUDD
NET PROMOTER SCORE
0 1 2 3 4 5 6 7 8 9 10
DETRACTORS PASSIVES PROMOTERS
% - % =NET PROMOTER SCORE
NetPromoterScore
Users of
Payment
Method #1
Users of
Payment
Method #2
Users of
Payment
Method #3
Users of
Payment
Method #4
disclaimer:All data in the presentation is fake and used only to demonstrate the topic.
CSAT
Search
Comparing Offers
Offer Selection
Checkout and Payment
How would you rate the recent product experience?
Search
Average Payment Method #4 users
Comparing
Offers
Offer
Selection
Checkout and
Payment
disclaimer:All data in the presentation is fake and used only to demonstrate the topic.
All users
Payment Method #4 users
Average age People under 30
disclaimer:All data in the presentation is fake and used only to demonstrate the topic.
NetPromoterScore
Users
over 30
Users
under 30
Users of Payment
Method #4
disclaimer:All data in the presentation is fake and used only to demonstrate the topic.
CORRELATION

CAUSATION
Never consider
data alone to avoid
spurious correlation.
The best designers
never stop at
the 鍖rst inference.
JARED SPOOL
DNADATA
MORE AND MORE
DATA
DISTRACTION
GOOD METRICS
SIMPLE
COMPARABLE
SIMPLE
ACTIONABLE
COMPARABLE
SIMPLE
VANITY
JOURNEY
DATA-DRIVEN
INSIGHT-DRIVEN
INSIGHT-DRIVEN
anna.jozanis@allegro.pl
linkedin.com/in/jozanka
START BEING

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When numbers are tricky