App Dev Worksheet: Button Size and Contrast

App development lesson 12: Buttons: size and contrast · Set 310 · 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.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
   Send button: 64 px tall
   Cancel button: 48 px tall
   Help button: 40 px tall (a) Help (b) Cancel (c) Send
2. 2.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
   Send button: 60 px tall
   Save button: 36 px tall
   Start button: 32 px tall
3. 3.🔘 Is this good or poor button design: a big, easy tap area? (a) good design (b) poor design
4. 4.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
   Next button: 36 px tall
   Back button: 48 px tall
   Save button: 36 px tall
   Start button: 44 px tall
5. 5.True or false: a clear word like Save is poor button design. (a) False (b) True
6. 6.🌗 Is white on dark green easy or hard to read on a button? (a) hard to read (b) easy to read
7. 7.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
   Start button: 40 px tall
   Back button: 52 px tall
   Done button: 48 px tall (a) Done (b) Start (c) Back
8. 8.🔘 Our rule: buttons are at least 48 px tall. The Next button is 28 px tall. How many px taller must it be?
9. 9.🌗 Is red on green easy or hard to read on a button? (a) hard to read (b) easy to read
10. 10.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Help button: 64 px tall
    Cancel button: 44 px tall
    Save button: 64 px tall
    Next button: 32 px tall
11. 11.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Save button: 56 px tall
    Next button: 52 px tall
    Back button: 48 px tall
    Help button: 40 px tall
12. 12.🔘 Our rule: buttons are at least 48 px tall. The Done button is 36 px tall. How many px taller must it be?
13. 13.🔘 Our rule: buttons are at least 48 px tall. The Help button is 40 px tall. How many px taller must it be?
14. 14.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Cancel button: 44 px tall
    Save button: 60 px tall
    Next button: 52 px tall
15. 15.True or false: icons with no meaning is poor button design. (a) True (b) False
16. 16.🌗 Is dark blue on black easy or hard to read on a button? (a) easy to read (b) hard to read
17. 17.Which colour pair is hard to read? (a) light grey on white (b) white on dark green (c) white on black (d) black on yellow
18. 18.🌗 Is dark blue on white easy or hard to read on a button? (a) hard to read (b) easy to read
19. 19.Which colour pair is easy to read? (a) black on pale grey (b) yellow on white (c) pale pink on white (d) red on green
20. 20.🔘 Is this good or poor button design: icons with no meaning? (a) poor design (b) good design
21. 21.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Done button: 32 px tall
    Start button: 72 px tall
    Send button: 48 px tall
    Cancel button: 64 px tall (a) Start (b) Send (c) Cancel (d) Done
22. 22.Which colour pair is hard to read? (a) pale pink on white (b) dark blue on white (c) black on yellow (d) white on black
23. 23.🔘 Is this good or poor button design: strong colour contrast? (a) good design (b) poor design
24. 24.True or false: a tiny 20 px button is poor button design. (a) True (b) False
25. 25.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Save button: 60 px tall
    Send button: 52 px tall
    Cancel button: 64 px tall
26. 26.🌗 Is pale pink on white easy or hard to read on a button? (a) easy to read (b) hard to read
27. 27.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Next button: 52 px tall
    Cancel button: 40 px tall
    Send button: 48 px tall (a) Next (b) Send (c) Cancel
28. 28.🔘 Our rule: buttons are at least 48 px tall. The Next button is 36 px tall. How many px taller must it be?
29. 29.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Save button: 32 px tall
    Start button: 36 px tall
    Send button: 40 px tall
    Help button: 32 px tall
30. 30.True or false: buttons almost touching is good button design. (a) False (b) True
31. 31.🌗 Is black on yellow easy or hard to read on a button? (a) easy to read (b) hard to read
32. 32.🔘 Is this good or poor button design: a tiny 20 px button? (a) good design (b) poor design
33. 33.Which colour pair is easy to read? (a) yellow on white (b) red on green (c) white on black (d) dark blue on black
34. 34.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Cancel button: 28 px tall
    Back button: 48 px tall
    Start button: 52 px tall
    Send button: 68 px tall (a) Send (b) Back (c) Start (d) Cancel
35. 35.True or false: space between buttons is poor button design. (a) False (b) True
36. 36.Which colour pair is hard to read? (a) white on dark green (b) dark blue on white (c) white on black (d) dark blue on black
37. 37.True or false: grey text on grey is good button design. (a) True (b) False
38. 38.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Next button: 40 px tall
    Start button: 56 px tall
    Done button: 64 px tall
39. 39.🔘 Our rule: buttons are at least 48 px tall. The Save button is 36 px tall. How many px taller must it be?
40. 40.🔘 Is this good or poor button design: a clear word like Save? (a) poor design (b) good design

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