App Dev Worksheet: Button Size and Contrast

App development lesson 12: Buttons: size and contrast · Set 249 · 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.Which colour pair is easy to read? (a) light grey on white (b) dark blue on white (c) dark blue on black (d) yellow on white
2. 2.True or false: a clear word like Save is poor button design. (a) False (b) True
3. 3.🔘 Is this good or poor button design: a clear word like Save? (a) poor design (b) good design
4. 4.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
   Back button: 48 px tall
   Start button: 32 px tall
   Help button: 32 px tall
5. 5.🌗 Is dark blue on white easy or hard to read on a button? (a) hard to read (b) easy to read
6. 6.🔘 Is this good or poor button design: icons with no meaning? (a) poor design (b) good design
7. 7.🔘 Our rule: buttons are at least 48 px tall. The Start button is 44 px tall. How many px taller must it be?
8. 8.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
   Save button: 36 px tall
   Done button: 52 px tall
   Help button: 40 px tall
9. 9.🔘 Is this good or poor button design: a tiny 20 px button? (a) good design (b) poor design
10. 10.🔘 Is this good or poor button design: buttons almost touching? (a) good design (b) poor design
11. 11.Which colour pair is hard to read? (a) white on black (b) dark blue on white (c) black on pale grey (d) pale pink on white
12. 12.Which colour pair is hard to read? (a) red on green (b) dark blue on white (c) white on dark green (d) white on black
13. 13.Which colour pair is hard to read? (a) black on pale grey (b) light grey on white (c) white on dark green (d) dark blue on white
14. 14.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Help button: 44 px tall
    Start button: 36 px tall
    Save button: 32 px tall
15. 15.🔘 Our rule: buttons are at least 48 px tall. The Cancel button is 20 px tall. How many px taller must it be?
16. 16.True or false: buttons almost touching is poor button design. (a) False (b) True
17. 17.Which colour pair is hard to read? (a) black on pale grey (b) white on black (c) black on yellow (d) yellow on white
18. 18.True or false: space between buttons is poor button design. (a) True (b) False
19. 19.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Start button: 40 px tall
    Next button: 68 px tall
    Done button: 72 px tall (a) Next (b) Done (c) Start
20. 20.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Help button: 44 px tall
    Send button: 68 px tall
    Back button: 60 px tall (a) Back (b) Help (c) Send
21. 21.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Start button: 40 px tall
    Send button: 52 px tall
    Help button: 40 px tall
22. 22.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Save button: 36 px tall
    Done button: 52 px tall
    Next button: 40 px tall
    Send button: 56 px tall
23. 23.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Start button: 48 px tall
    Save button: 56 px tall
    Back button: 32 px tall
24. 24.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Back button: 48 px tall
    Cancel button: 24 px tall
    Done button: 52 px tall
    Start button: 68 px tall (a) Start (b) Cancel (c) Done (d) Back
25. 25.🔘 Is this good or poor button design: a big, easy tap area? (a) poor design (b) good design
26. 26.🔘 Is this good or poor button design: grey text on grey? (a) poor design (b) good design
27. 27.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Help button: 32 px tall
    Back button: 52 px tall
    Send button: 72 px tall (a) Send (b) Back (c) Help
28. 28.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Done button: 48 px tall
    Save button: 48 px tall
    Help button: 52 px tall
    Cancel button: 44 px tall (a) Save (b) Done (c) Help (d) Cancel
29. 29.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Cancel button: 36 px tall
    Next button: 32 px tall
    Save button: 64 px tall
    Send button: 52 px tall
30. 30.True or false: grey text on grey is good button design. (a) True (b) False
31. 31.🔘 Our rule: buttons are at least 48 px tall. The Done button is 28 px tall. How many px taller must it be?
32. 32.🔘 Our rule: buttons are at least 48 px tall. The Help button is 24 px tall. How many px taller must it be?
33. 33.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Next button: 48 px tall
    Send button: 44 px tall
    Cancel button: 48 px tall
34. 34.🔘 Our rule: buttons are at least 48 px tall. The Start button is 36 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?
    Save button: 68 px tall
    Done button: 48 px tall
    Cancel button: 24 px tall (a) Cancel (b) Save (c) Done
36. 36.True or false: a tiny 20 px button is good button design. (a) False (b) True
37. 37.True or false: space between buttons is good button design. (a) False (b) True
38. 38.🌗 Is yellow on white easy or hard to read on a button? (a) hard to read (b) easy to read
39. 39.🔘 Our rule: buttons are at least 48 px tall. The Save button is 28 px tall. How many px taller must it be?
40. 40.True or false: a big, easy tap area is good button design. (a) False (b) True

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