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Calculating lostness

Lostness L = √((N/S − 1)² + (R/N − 1)²), where S = total pages visited, N = distinct pages and R = minimum pages needed. A user visits 10 pages (8 distinct) on a task needing 4. What is L, and what does it suggest?

A.About 0.54; the user was likely lostB.About 0.20; navigation was efficientC.About 0.80; the task failedD.Exactly 0; the user took the best path

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Calculating lostness

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