David ParkOpen to roles
All work
Case study 03 — User understanding

Our first dealership couldn't add a photo.

I stopped guessing what sellers were seeing, and built a way to see it for myself.

RoleCo-founder & CEO, leading product, design and build
Timeline[Year]
UsersIndividual sellers and dealership staff
ProductsSell Your Car, dealership area, admin
Carmate's Sell Your Car page: list in five minutes, in three steps
01  Context

Users new to the web

Most of our sellers grew up on Facebook, not on websites. They bring its habits with them. Things I assumed were obvious often weren't, and I couldn't design around problems I never saw.

02  What happened

Simple tasks failed

When our first dealership started using the seller tools, staff couldn't add photos. They typed the dealership's details into their personal profile instead of the dealership's store profile.

And each type of seller sees a different version of the product. From my own account, I couldn't see what they saw.

03  The call

See exactly what they see

I built a way for our team to log in to a seller's account. It shows the product exactly as that seller sees it: where they get stuck, and bugs that only appear for their type of account.

When a seller is stuck, we can also finish the task with them instead of losing them.

[Who can use it, and how each use is recorded]

04  The insight

“Design for the mistake, not the ideal user.”

People weren't careless. They were using habits from the apps they knew on a kind of product they had never used. Every mistake was information about the design.

05  What changed

Small fixes, found by watching

The showroom in the riverA dealership pinned its showroom in the middle of the river. A buyer following the map would have driven into the water.The location picker now rejects a pin on water, off a road, or outside Cambodia.
The telecom dropdownCalling across networks is a real problem in Cambodia, so every phone form made people pick their telecom. One more field to get wrong.I mapped each network's number prefixes. Every phone field now works out the network from the number itself.
Details in the wrong profileDealership details typed into a personal profile.[What changed — e.g. a separate dealership area]
Photos that never got addedStaff couldn't finish adding photos to a listing.[What changed in the photo step]
06  Result

Acting on the first signal

So far this is one dealership, and I'd rather say so. I didn't wait for the same mistake to repeat across many sellers before fixing it. Each problem the first dealership hit now has a fix in the product, before the next seller arrives.

[A number if you have one — e.g. listings the dealership has posted, or time to set up]

07  In hindsight

What I'd do differently

I'd build the way to see what sellers see before the first seller signs up, not after. It's the cheapest research tool we have.

Next — Case study 04We launched as an app. Almost nobody installed it.