Editing Point and click (section)

==Fitts's Law==
[[Fitts's law]] can be used to quantify the time required to perform a point-and-click action.

<math>T = a + b \log_2 \Bigg(1+\frac{D}{W}\Bigg)</math>
where:
* <math>T</math> is the average time taken to complete a single movement.
* <math>a</math> represents the start/stop time of the device and <math>b</math> stands for the inherent speed of the device. These constants can be determined experimentally by fitting a straight line to measured data.
* <math>D</math> is the distance from the starting point to the center of the target.
* <math>W</math> is the width of the target measured along the axis of motion. <math>W</math> can also be thought of as the allowed error tolerance in the final position since the final point of the motion must fall within <math>\pm\frac{W}{2}</math> of the target's centre.