The simplest of the types of die roll challenges.

The GM figures out the difficulty, the Player chooses a skill, a roll is made to see if the modified skill meets or surpasses the difficulty. Simple. (FUG 9)

The Margin Of Success can further describe the scale of the achievement:

MoS	Degree	Magnitude	Duration
0	Minimal	Negiligible	Instant
1	Competent	Minor	Momentary
2	Solid	Moderate	Scene
3	Significant	Major	Session
4	Perfection	Overwhelming	Long Term

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FATE Mechanics, Tests And Challenges