Salesforce Style Guide for Documentation and User Interface Text

About This Guide
Styles A-Z
A
B
C
D
E
F
Fewer, Less
Field
Field Names
File
File Names and Extensions
File Types
Filter Criteria Examples
First Person
Folder Names
Following
G
H
I
J
K
L
M
N
O
P
Q
R
S
T
U
V
W
Glossary
PDF

Fewer, Less

Less refers to quantity while fewer refers to number. For example:
  • We recommend fewer than five filters.
  • Smaller organizations receive less than 1 GB of storage.

Be aware of your meaning. The sentence I have less problems than they means my problems aren't as big, whereas fewer problems would mean that mine aren't as numerous.