Precision vs Accuracy

Ok, this one may not be completely intuitive, but there is a difference between precision and accuracy in the world of robotic motion and robotic-aided assembly and manufacturing. A common way to think of the difference between the two is the dart board analogy. As shown below, accuracy can be thought of hitting the exact mark you intended to hit- the very center of the dart board. Precision can be thought of as hitting the same spot every time- repeatability, but not necessarily in the exact spot you intended.

One dart in the exact center is accurate. 3 darts in the same position off-center represent precision.