INVEST in good stories.

But 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

SMART tasks

There is an acronym for creating effective goals: "SMART" -

    S – Specific
    M – Measurable
    A – Achievable
    R – Relevant
    T – Time-boxed

via INVEST in Good Stories, and SMART Tasks | XP123.