App Dev Worksheet: Button Size and Contrast

App development lesson 12: Buttons: size and contrast · Set 550 · 40 questions

Developer's tip (Big and bold): Our rule: every button is at least 48 px tall. Missing px = 48 − height. Leave space between buttons; use clear words like Save or Send. Strong contrast (black on yellow, white on dark green) is easy to read; similar colours are hard.

1. 1.🔘 Is this good or poor button design: a clear word like Save? (a) poor design (b) good design
2. 2.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
   Back button: 48 px tall
   Help button: 60 px tall
   Next button: 36 px tall
   Done button: 40 px tall
3. 3.Which colour pair is easy to read? (a) light grey on white (b) white on dark green (c) dark blue on black (d) yellow on white
4. 4.Which colour pair is easy to read? (a) pale pink on white (b) black on yellow (c) red on green (d) light grey on white
5. 5.🔘 Our rule: buttons are at least 48 px tall. The Start button is 28 px tall. How many px taller must it be?
6. 6.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
   Send button: 52 px tall
   Cancel button: 40 px tall
   Save button: 36 px tall
7. 7.🌗 Is dark blue on black easy or hard to read on a button? (a) hard to read (b) easy to read
8. 8.🔘 Our rule: buttons are at least 48 px tall. The Start button is 36 px tall. How many px taller must it be?
9. 9.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
   Cancel button: 36 px tall
   Done button: 56 px tall
   Send button: 56 px tall (a) Done (b) Send (c) Cancel
10. 10.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Start button: 64 px tall
    Back button: 40 px tall
    Save button: 32 px tall
    Next button: 44 px tall
11. 11.True or false: strong colour contrast is poor button design. (a) False (b) True
12. 12.True or false: a tiny 20 px button is good button design. (a) True (b) False
13. 13.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Help button: 64 px tall
    Back button: 36 px tall
    Next button: 52 px tall
    Start button: 68 px tall (a) Help (b) Back (c) Next (d) Start
14. 14.Which colour pair is easy to read? (a) red on green (b) dark blue on black (c) dark blue on white (d) pale pink on white
15. 15.🔘 Our rule: buttons are at least 48 px tall. The Start button is 32 px tall. How many px taller must it be?
16. 16.True or false: a big, easy tap area is good button design. (a) False (b) True
17. 17.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Start button: 48 px tall
    Cancel button: 40 px tall
    Save button: 56 px tall
    Next button: 72 px tall (a) Start (b) Cancel (c) Save (d) Next
18. 18.🔘 Is this good or poor button design: grey text on grey? (a) good design (b) poor design
19. 19.🌗 Is pale pink on white easy or hard to read on a button? (a) hard to read (b) easy to read
20. 20.🔘 Is this good or poor button design: icons with no meaning? (a) poor design (b) good design
21. 21.🌗 Is light grey on white easy or hard to read on a button? (a) easy to read (b) hard to read
22. 22.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Send button: 52 px tall
    Done button: 32 px tall
    Cancel button: 32 px tall
    Start button: 32 px tall
23. 23.🔘 Is this good or poor button design: a tiny 20 px button? (a) good design (b) poor design
24. 24.True or false: space between buttons is poor button design. (a) False (b) True
25. 25.Which colour pair is hard to read? (a) dark blue on black (b) black on pale grey (c) white on dark green (d) black on yellow
26. 26.Which colour pair is hard to read? (a) black on pale grey (b) black on yellow (c) yellow on white (d) white on black
27. 27.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Save button: 56 px tall
    Done button: 56 px tall
    Send button: 36 px tall (a) Save (b) Done (c) Send
28. 28.True or false: a clear word like Save is good button design. (a) False (b) True
29. 29.🌗 Is white on black easy or hard to read on a button? (a) hard to read (b) easy to read
30. 30.Which colour pair is easy to read? (a) pale pink on white (b) black on pale grey (c) light grey on white (d) yellow on white
31. 31.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Save button: 52 px tall
    Start button: 72 px tall
    Send button: 32 px tall (a) Start (b) Save (c) Send
32. 32.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Send button: 52 px tall
    Start button: 52 px tall
    Back button: 32 px tall (a) Send (b) Start (c) Back
33. 33.🔘 Our rule: buttons are at least 48 px tall. The Help button is 28 px tall. How many px taller must it be?
34. 34.🔘 Our rule: buttons are at least 48 px tall. The Help button is 24 px tall. How many px taller must it be?
35. 35.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Next button: 68 px tall
    Start button: 64 px tall
    Back button: 52 px tall
    Cancel button: 40 px tall (a) Cancel (b) Start (c) Back (d) Next
36. 36.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Cancel button: 32 px tall
    Next button: 60 px tall
    Send button: 68 px tall (a) Send (b) Cancel (c) Next
37. 37.🌗 Is yellow on white easy or hard to read on a button? (a) hard to read (b) easy to read
38. 38.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Back button: 40 px tall
    Save button: 60 px tall
    Send button: 48 px tall
    Next button: 52 px tall (a) Save (b) Back (c) Next (d) Send
39. 39.🌗 Is white on dark green easy or hard to read on a button? (a) easy to read (b) hard to read
40. 40.True or false: a clear word like Save is poor button design. (a) False (b) True

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