In the schematics at the end of this document, there are a bunch of resistors. The author says in a footnote:
Part Notes, All Pages: Unless noted:
Resistors are 5%, 0.12 W, or better, for standard 5% values.
Resistors are 1%, 0.25 W, or better, metal film, for standard 1% values.
Resistors are 0.1%, 0.25 W, or better, metal film, if 4 significant digits are given.
But how do I know which resistors are 5%, 1%? The 0.1% is clear.