XP teams have to manage stories and tasks. The INVEST and SMART acronyms can remind teams of the good characteristics of each.
What are characteristics of a good story? The acronym “INVEST” can remind you that good stories are:
I – Independent
N – Negotiable
V – Valuable
E – Estimable
S – Small
T – Testable
There is an acronym for creating effective goals: “SMART”
S – Specific
M – Measurable
A – Achievable
R – Relevant
T – Time-boxed
Author = Bill Wake (XP123)
https://xp123.com/articles/invest-in-good-stories-and-smart-tasks/