Harmonized method validation

Hello everybody
I have already started studying harmonized method. If needs be I m pleased to help anytime.

[quote=Mel]Hello everybody
I have already started studying harmonized method. If needs be I m pleased to help anytime.[/quote]

what do you mean by harmonized method and what is the diffrence between that method and any other methods (e.g. pharmacopial methods, in-house methods, etc…)