What does WSSI mean?
WSSI is an abbreviation of Weekly Sales and Stock Intake. It's often pronounced Whizzy.
This is usually a spreadsheet where stock managers list the number of units which have been sold alongside a list of units which have been delivered. It is usually completed on a weekly basis but can be monthly.
The purpose of a WSSI is to help the buyer decide when the shop should stock up on some products or order fewer of others.