TRACKING

Page name: TRACKING
Description: ‘Choosing the right tracking helps legibility’
1.  Use one sentence from your text. Type it, aligning the baseline with the first of your horizontal guides
2. Duplicate this sentence twice so that there are three copies, spaced 1 inch apart, vertically centered on the page 
3. Decrease tracking of the first sentence, so it is difficult to read
4. Increase tracking of the first sentence, so it is difficult to read
5. Write this info in small thin type under each sentence correspondingly:
‘Letter spacing is too small (ex. -50)’
‘Regular letter spacing (ex. 0)’
‘Letter spacing is too big (ex. +75)’
Note: your numbers in parenthesis could be different depending on the font family.

My example: