S.M.A.R.T.

Alternatives:
Specific, Measurable, Achievable, Relevant and Time-bound.
Specific, Measurable, Attainable, Relevant and Time-bound.
Specific, Measurable, Acceptable, Realistic and Time-bound.

It can also be referenced (although less correctly) as:
S Simple, specific with a stretch, sensible, significant.
M Meaningful, motivating.
A Acceptable, achievable, action-oriented, accountable, as-if-now, agreed, agreed-upon, actionable, assignable.
R Realistic, reviewable, relative, rewarding, reasonable, results-oriented, relevant to a mission.
T Timelines, time-frame, time-stamped, tangible, timely, time-based, time-specific, time-sensitive, timed, time-scaled, time-constrained, time-phased, time-limited, time-driven, time-related, time-line, timed and toward what you want, truthful.