EDGE

TATIANA MAC

@TatianaTMac

CASES

TatianaMac.com/EdgeCases

@TatianaTMac

Slide into the slides

Slide into the DMs

THANK YOU TO SPONSORS

First Name

Tatiana

Last Name

Mac

Gender

Male

Female

Prefer not to say

Race

White

African American

Hispanic

Native American

Asian/Pac Islander

Other

Meh

😕

First Name

Yong-mi

Given name

Last Name

Kim

Family Name

Yong-Mi Kim
Kim Yong-Mi 

Printed Name

Actual Name

Defeated

😔

Gender

Male

Female

Prefer not to say

Nonbinary, prefers to say

Gender Breakdown

78%

30%

2%

MALE

FEMALE

?

Undisclosed Males
Undisclosed Females

Undisclosed Nonbinary Folks
Disclosed Nonbinary Folks

Erased

🥺

Race

White

African American

Hispanic

Native American

Asian/Pac Islander

Other

Confused

🤔

Confused

🤔

Erased

🥺

Defeated

😔

Derafused

Annoyed

🙄

Those are statistical anomalies, uncommon.

Yeah, but she planned it that way.

I've never met a
Black Korean trans person before.

This is too confusing—why can't we make it simpler?

EDGE

CASES

a problem or situation that occurs only at an extreme (maximum or minimum) operating parameter

edge cases

 problem or situation

causes issues,

merits solving

temporary,

defined by surroundings

You cause issues.
You are a problem to be solved. Your identity is temporary and defined by your surroundings.

How derafusing

a problem or situation that occurs only at an extreme (maximum or minimum) operating parameter

edge cases

What creates extremes?

Extremes require parameters.

USER

USER

USER

USER

USER

USER

USER

GROUP

CONTRAST

SKIN TONE

DEVICES

$

$$$

$

$$$

NYC

PDX

BER

23:00

14:00

17:00

Every new beginning comes from some other
beginning's end

🎶

🎶

SEMISONIC

One-hit wonders,

Not-wrong UX Designers

Parameters are arbitrary.*

GROUP

USER

USER

USER

USER

USER

USER

USER

GROUP

USER

USER

USER

USER

USER

USER

USER

Who picked the shape?

Who determined its size?

Who decided that was enough?

GROUP

USER

USER

USER

USER

USER

USER

USER

USER

ME

$

$$$

We test rigorously
on ourselves.

Who are we?

THE REST
OF US

NEURO-
TYPICAL

MALE

HETERO

CIS

WHITE

ABLE-BODIED

GROUP

WEALTHY

So, let's just make the parameters bigger?

USER

USER

USER

USER

USER

USER

USER

GROUP

CONUNDRUM

🥁

Why do we define
edge cases?

Limitation

Boundary

Budget

Limitations means exclusivity,
which means premium costs, which means triple bottom line, babyyyyyyy.

👃🏾

sniff

sniff

KAPITALI$MU$

Kapitalismus scares
us with scarcity.

(Not fabricated out of thin air.)

Limitations means exclusivity,
which means premium costs, which means triple bottom line, babyyyyyyy.

triple bottom line

NEURO-
TYPICAL

MALE

HETERO

CIS

WHITE

ABLE-BODIED

GROUP

WEALTHY

We are not
immune to this.

YOU

THEY

I

SHE

HE

White
supremacist
capitalist
patriarchy

Keeping meritocratic mediocrity in power since the 17th century!™

You can contribute
to systems that harm you.

YOU

THEY

I

SHE

HE

(And they can simultaneously
benefit you.)

We are not at
fault for this.

But we are
responsible.

...Regardless of
our intent.

Intent does not erase impact.

Intent

impact.

USER

CREATOR

Intent does not erase impact.

EXCLUSION

LIMITATION

The system isn't broken,
it's working as intended.

Intent does not erase impact.

MARGINALIZATION

LIMITATION

REPEATED

Sigh.

HOW TO FIX

BREAK

🤓 MATH 🤓

Topology

STRETCH

COMPRESS

BEND

TEAR

GLUE

COLLAPSE

Topology

Recentre the circle.

STEP ONE

A

B

B

A

Recentres the marginalised.

A

But doesn't that just
marginalise someone else?

B

A

Nope.

A

B

B

A

NEURO-
TYPICAL

MALE

HETERO

CIS

WHITE

ABLE-BODIED

GROUP

WEALTHY

Centring the most vulnerable ensures that everyone is included.

Accessibility helps everyone.

Embrace contradiction.

STEP TWO

Do I contradict myself?
Very well, then I contradict myself,
I am large, I contain multitudes.

WALT WHITMAN

B

A

A

B

In the middle,
At the edge

Things will seem contradictory.

Capitalism tells us there is one truth.

One truth is simple.

Abundance allows for nuance.

Abundance allows for simultaneous truths.

What is good for one user, might be bad for another.

Minimise harm to all

Flip the script.

STEP THREE

Intent
defines
Impact

USER

CREATOR

Form
follows
function

LOUIS SULLIVAN

Intent
follows
Impact

USER

CREATOR

Intent
follows
Impact

USER

CREATOR

EXCLUSION

LIMITATION

of the

of the

Intent
follows
Impact

USER

CREATOR

INCLUSION

EXPANSION

of the

of the

Knowledge

Understanding

Compassion

 

CREATOR

EXPANSION

of the

Empathy,

a word

Empathy is
a scam.

the capacity to understand or feel what another person is experiencing from within their frame of reference, that is, the capacity to place oneself in another's position.

empathy

Empathy seeks to validate someone else's lived experience
by centring our own.

GROUP

USER

USER

USER

USER

USER

USER

USER

USER

ME

$

$$$

Define the impact you want to have first.

Ask "who is missing?"

STEP FOUR

Who holds the power to define who is missing?

Find new edges. Make new centres.

Edge Cases: Out of the margin and into view

By Tatiana Mac

Edge Cases: Out of the margin and into view

The term edge case is used to describe something rare that only occurs at an extreme. In praxis, we often use the term to dismiss a use case's relevance to the broader success of our product or service. But edge cases can be portals to safety leaks, unserved populations, and unconsidered journeys. By centring edge cases in our process and examining what they can tell us, we can work towards more ethical, inclusive, and considered products

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