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We run two websites and as part of our KPIs we are treating those who visit 3 or more pages of our website as a client served. As a digital team we are not convinced that this is the best metric to use as the improvements we are making to the sites mean that people are able to find the information quicker. Additionally other organisations including forums etc link to us so those users will get the info they need in one click. What I would like to know is how Google calculates page depth in GA. Are they treating the landing page  as ground zero and then when  users clicks a link they go one page deep? Or is the landing page, page depth 1 . Is page depth a measure of how many clicks a user needs to find their information?