Exercise 3 - solution (model note; your tasting will differ)

Coffee A: Body medium, like semi-skimmed milk. Sweetness moderate. Acidity bright and sharp (a good thing, not sour). Flavour fruity and caramel. Aftertaste short and clean.
Coffee B: Body full, like whole milk. Sweetness low. Acidity soft. Flavour earthy and nutty with a smoky edge. Aftertaste long and slightly bitter.

Possible causes (guesses, check): different species or origin (chapters 1-2), different processing (chapter 3), different roast level (chapter 4), or a different grind and brew method (chapters 5-7).

Tip: change only one thing at a time (for example the same beans brewed two ways) so you know what caused a difference.