🛡 Index of difficulty §

= how difficult a task is independent from the input device

Formulas §

🖱 Fitts Law §

$ID:$ index of difficulty in bits $D:$ target distance $W:$ target width $ID={\log }_2(1+\frac{D}{W}))$

🚗 Steering law §

$ID:$ index of difficulty in bits $D:$ target distance $W:$ target width $ID=\frac{D}{W}$

🔗 Links

🖱 Fitts Law