Usability FailGustavo A ValeroMaster in Web EngineeringUniversity of Oviedo

AutobarCoffee

Machine

• Instruction Screen

• Payment Area

• Drinks area• Sugar selector• Drink selector• Drink delivery

AutobarCoffee

Machine

• Instruction Screen

• Payment Area

• Drinks area• Sugar selector• Drink selector• Drink delivery

Select drink

Insert money

[Drink Preparation]

Grab the drink

Take the change

Machine Process

Select drink

Insert money

[Drink Preparation]

Grab the drink

Take the change

?Machine Process

SolutionsO Insert moneyO Select sugarO Select drinkO Take your

changeO Grab your

drinkand Enjoy!

• Instructions sticker

• New machine design• Relocate change

slot• Bigger screen

Questions?