Empathy
The ability to understand and share the feelings of another
Our development decisions affect other people
People use different devices and browsers than you
BrowserStack
https://www.browserstack.com/
People have slower internet than you
Google Page Speed
https://developers.google.com/speed/pagespeed/
People have different accessibility needs than you
Make WP Accessible
https://make.wordpress.org/accessibility/useful-tools/
People speak different languages than you
WP Internationalization Test
https://developer.wordpress.com/2015/04/23/wordpress-developers-test-your-i18n-internationalization-knowledge/
Empathize with Your Clients
Developers are often UI/UX Designers
What is best for the client?
What is easiest for me?
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Where would the client expect to update things?
What is best for the client?
How would I want this?
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User Onboarding
http://www.useronboard.com/
Empathize with Future Developers
You may be the future developer of whatever project you're working on
You are the past developer of whatever project you're working on
Coding Standards
https://codex.wordpress.org/WordPress_Coding_Standards
Empathize Through Diversity