Rating an interface against the useability principles

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Date:

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Quick Questions

Shade in the A or B circle for each question.

1. A tester completes every task in a booking app with no errors. Which rating fits the effectiveness principle?

A Met, because all tasks were completed correctly

B Not met, because the app has too many screens

2. Which statement is a rating with evidence?

A Safety is partly met: I just feel the app is okay

B Safety is partly met: 3 of 5 testers deleted a file by accident with no warning

3. A text-to-speech option exists, but screen reader users cannot reach the Submit button. What is the best accessibility rating?

A Met

B Partly met

4. Only 1 of 6 new users could find the settings menu without help. Which rating suits learnability?

A Not met

B Met

5. Which rating options can be used for each useability principle?

A Met, partly met or not met

B Pass, merit or distinction

Match the Pairs

Draw a line connecting each item on the left to its match on the right.

Left column		Right column
1Effectiveness: Met		AEvery tester finished the task they were given, so the interface does what users need it to do
2Safety: Not met		BTesters deleted data by accident and nothing warned them or let them undo it
3A Partly met rating needs evidence showing some success and some problems		CLearnability: Partly met - 3 of 5 testers found Save without help
4Every rating must be backed by evidence from testing, not just an opinion		DThe evidence does not support the rating: only 1 of 5 testers completed the task, so it should be Not met or Partly met
5Utility: Met - I think the app looks nice		EThe rating is based on an opinion about looks, not testing evidence, and looks do not show utility
6Effectiveness: Met - 1 of 5 testers finished the task		FAccessibility: Met - all 5 testers read the text and used alt text

Definitions

Useability rating

Fill in the Blanks

Complete each line of code by filling in the missing parts.

Principle: ______ Evidence: Delete asks "Are you sure?" first Rating: Met

Principle: Effectiveness Evidence: 5 of 5 users finished the task Rating: ___

Principle: Accessibility Evidence: No alt text on any image Rating: _______

Principle: Learnability Evidence: 3 of 5 users found Help unaided Rating: __________

Principle: Utility ________: Search works but has no filters Rating: Partly met

Spot the Error

Shade in the letter of the line that contains an error.

Question 1

A Principle: Effectiveness

B Task: Book a ticket

C Result: 5 of 5 users finished

D Rating: Not met

Question 2

A Principle: Safety

B Rating: Met

C Good: Delete shows a warning

D Gap: Quit has no warning

Question 3

A Principle: Accessibility

B Evidence: 3 images no alt text

C Rating: Almost met

Question 4

A Principle: Utility

B Need: Check due dates

C Evidence: I like the colours

D Rating: Met

Question 5

A Principle: Attractiveness

B Test: New users, no help given

C Evidence: 4 of 5 done in 2 min

D Rating: Met

Answer Key

Rating an interface against the useability principles

Section A: Quick Questions

A — Met, because all tasks were completed correctly

B — Safety is partly met: 3 of 5 testers deleted a file by accident with no warning

B — Partly met

A — Not met

A — Met, partly met or not met

Section B: Match the Pairs

Effectiveness: Met → Every tester finished the task they were given, so the interface does what users need it to do

Safety: Not met → Testers deleted data by accident and nothing warned them or let them undo it

A Partly met rating needs evidence showing some success and some problems → Learnability: Partly met - 3 of 5 testers found Save without help

Every rating must be backed by evidence from testing, not just an opinion → Accessibility: Met - all 5 testers read the text and used alt text

Utility: Met - I think the app looks nice → The rating is based on an opinion about looks, not testing evidence, and looks do not show utility

Effectiveness: Met - 1 of 5 testers finished the task → The evidence does not support the rating: only 1 of 5 testers completed the task, so it should be Not met or Partly met

Section C: Definitions

Useability rating — Judging an interface against accessibility, effectiveness, safety, utility and learnability as met, partly met or not met, with testing evidence for each rating.

Section D: Fill in the Blanks

Principle: Safety
Evidence: Delete asks "Are you sure?" first
Rating: Met

Principle: Effectiveness
Evidence: 5 of 5 users finished the task
Rating: Met

Principle: Accessibility
Evidence: No alt text on any image
Rating: Not met

Principle: Learnability
Evidence: 3 of 5 users found Help unaided
Rating: Partly met

Principle: Utility
Evidence: Search works but has no filters
Rating: Partly met

Section E: Spot the Error

D — All 5 of 5 users finished the task, so the evidence supports a rating of Met. The line should read 'Rating: Met'.

B — The evidence shows one safety feature works and one is missing, so the principle is only partly met. The line should be 'Rating: Partly met'.

C — Ratings must be one of Met, Partly met or Not met. 'Almost met' is not a valid rating. It should be 'Rating: Partly met'.

C — Evidence must come from testing and relate to the user need. A personal opinion about colours says nothing about utility. It should be something like 'Evidence: App lists all dates'.

A — The five useability principles are accessibility, effectiveness, safety, utility and learnability. Attractiveness is not one of them. The test is about learnability.