A UX metric that will help measure the effectiveness of your product.
The lostness metric can tell you how lost users are when they use your product.
The metric itself is pretty simple as it ranges from zero to one. A high score of lostness means users are having trouble finding what they want. A low score means the opposite, that they are able to find what they want with relative ease. Anything under 0.4 indicates that there are not lost and anything over indicates that they’re lost.
The only way you can measure it is when you know what your users are wanting to do. It’s unlikely analytical data or logs will help you measure it because you don’t know what the users are trying to do.
So the best way to determine it is through usability testing, where you get users to complete a task. This way you know exactly what they’re trying to do and what is the best (quickest) path and how lost they are.
It’s all based on the formula below.
L = Lostness
N = The number of different screens visited during the task.
S = The total number of screens visited during the task.
R = The minimum number of screens that must be visited to complete a task.
The best way to understand the formula is through an example.