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• A client requests access to a provider’s service using its own unique client ID and secret token.
• The user logs into the service directly (using a web page on the provider’s server) and grants the client permission to access.
• The provider redirects the user to a URL unique to the client passing along a verification code in the query string.
• The client verifies the authorization request and uses the verification code from step 3 to obtain an access token.
• The client may periodically refresh the access token when it expires.

Source: OAuth2 for iPhone and iPad applications

上圖只是簡單的流程示範，不過是隨口多一句「喂、幫我加個驗證碼功能」，Flow Chart 就會突然肥一截。真正的會員登入驗證還有更多花樣以及安全性考量，比如登入錯誤 3 次就多提示一句「忘記密碼」等等，更狠的直接鎖帳號請使用者找客服申訴。Flow Chart 和 UI Flow 相輔相成，甚至是先有 Flow Chart 才有 UI Flow 。在沒有 Flow Chart 、不知道要處理多少判斷時就產出 UI Flow，規劃不周掉頁面漏功能的機率非常非常高。

Source: Flow Chart 和 UI Flow « 嫁給RD的 UI Designer

Who better than a hostage negotiator to help you navigate that family land mine known as Thanksgiving?

Source: Crisis Negotiators Give Thanksgiving Tips