This is a lesson given by Prof. Aaron Elmore and taught as the Santa
Barbara's style, though I already learnt most of this at EPFL with
Prof. Anastasia Ailamaki. This is an easy mnemonic to remember it:
W - what or why am I showing this?
A - axes, describe both the vertical and horizontal axes
L - lines or bars, show them one by one
T - trends
E - exceptions
R - recap what you showed in the graph or give a final conclusion, preferably a punchline
