[Sigia-l] IA Mythbusters - impact of redesign in traffic

[Livia Labate]

Often I hear quotes at work about user behavior, metrics and design 
guidelines that I can't imagine where people pulled from. I'm starting 
to capture them to see if there is a way to uncover the truth in them.

First one:

"Whenever sites go through redesign there is a dip in traffic, then 
rebound and increase [...] 20% dip is an industry standard (average), 
but the dips range typically depend on the scope of changes"

 From your experience, what validates or invalidates this?