App Dev Worksheet: Button Size and Contrast

App development lesson 12: Buttons: size and contrast · Set 70 · 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.True or false: a clear word like Save is poor button design. (a) True (b) False
2. 2.🔘 Our rule: buttons are at least 48 px tall. The Save button is 36 px tall. How many px taller must it be?
3. 3.🔘 Our rule: buttons are at least 48 px tall. The Start button is 28 px tall. How many px taller must it be?
4. 4.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
   Done button: 40 px tall
   Next button: 32 px tall
   Send button: 36 px tall
5. 5.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
   Start button: 52 px tall
   Next button: 56 px tall
   Save button: 32 px tall
6. 6.🔘 Is this good or poor button design: grey text on grey? (a) good design (b) poor design
7. 7.🔘 Our rule: buttons are at least 48 px tall. The Next button is 20 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?
   Start button: 40 px tall
   Send button: 60 px tall
   Save button: 56 px tall
9. 9.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
   Save button: 56 px tall
   Help button: 28 px tall
   Cancel button: 48 px tall (a) Help (b) Cancel (c) Save
10. 10.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Save button: 48 px tall
    Cancel button: 52 px tall
    Done button: 32 px tall
    Send button: 32 px tall
11. 11.Which colour pair is easy to read? (a) dark blue on black (b) light grey on white (c) dark blue on white (d) yellow on white
12. 12.True or false: space between buttons is poor button design. (a) False (b) True
13. 13.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Save button: 72 px tall
    Cancel button: 48 px tall
    Back button: 24 px tall (a) Back (b) Cancel (c) Save
14. 14.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Send button: 72 px tall
    Cancel button: 24 px tall
    Start button: 48 px tall
    Done button: 48 px tall (a) Cancel (b) Done (c) Start (d) Send
15. 15.Which colour pair is easy to read? (a) red on green (b) white on dark green (c) dark blue on black (d) pale pink on white
16. 16.True or false: grey text on grey is poor button design. (a) False (b) True
17. 17.Which colour pair is hard to read? (a) dark blue on white (b) white on dark green (c) yellow on white (d) black on pale grey
18. 18.🔘 Is this good or poor button design: strong colour contrast? (a) poor design (b) good design
19. 19.🌗 Is white on dark green easy or hard to read on a button? (a) easy to read (b) hard to read
20. 20.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Next button: 72 px tall
    Done button: 48 px tall
    Help button: 40 px tall (a) Next (b) Done (c) Help
21. 21.True or false: buttons almost touching is poor button design. (a) True (b) False
22. 22.🌗 Is dark blue on black easy or hard to read on a button? (a) hard to read (b) easy to read
23. 23.Which colour pair is easy to read? (a) red on green (b) light grey on white (c) black on pale grey (d) dark blue on black
24. 24.Which colour pair is hard to read? (a) dark blue on white (b) white on black (c) red on green (d) white on dark green
25. 25.🌗 Is yellow on white easy or hard to read on a button? (a) easy to read (b) hard to read
26. 26.Which colour pair is hard to read? (a) dark blue on white (b) white on dark green (c) black on pale grey (d) dark blue on black
27. 27.Which colour pair is easy to read? (a) light grey on white (b) black on yellow (c) red on green (d) pale pink on white
28. 28.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Back button: 72 px tall
    Help button: 44 px tall
    Start button: 48 px tall (a) Start (b) Help (c) Back
29. 29.True or false: icons with no meaning is good button design. (a) True (b) False
30. 30.🔘 Is this good or poor button design: a clear word like Save? (a) poor design (b) good design
31. 31.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Start button: 36 px tall
    Cancel button: 40 px tall
    Save button: 48 px tall
    Back button: 40 px tall
32. 32.🔘 Our rule: buttons are at least 48 px tall. The Send button is 32 px tall. How many px taller must it be?
33. 33.🔘 Our rule: buttons are at least 48 px tall. The Save button is 44 px tall. How many px taller must it be?
34. 34.🔘 Our rule: buttons are at least 48 px tall. The Help button is 28 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?
    Start button: 56 px tall
    Send button: 72 px tall
    Done button: 44 px tall (a) Done (b) Send (c) Start
36. 36.🔘 Our rule: buttons are at least 48 px tall. The Back button is 28 px tall. How many px taller must it be?
37. 37.🔘 Is this good or poor button design: a tiny 20 px button? (a) poor design (b) good design
38. 38.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Next button: 72 px tall
    Cancel button: 68 px tall
    Back button: 32 px tall (a) Next (b) Cancel (c) Back
39. 39.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Done button: 40 px tall
    Send button: 40 px tall
    Back button: 48 px tall
40. 40.🔘 Our rule: buttons are at least 48 px tall. The Done button is 24 px tall. How many px taller must it be?

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