Why EAI(XI) is needed

Dear all;
i have one question regarding why XI or EAI has to be used against direct development, is fundamental question, but very important..
As far as i know, advantage is below;
1. make stadard pattern to build development easily.
2. central management, centeral monitoring.
i would like to know why EAI(XI) is needed for technical key point except for above advantage ?
please do not mention SOA, BPM and SAP XI Contents, just look inside technical key point.
thank you in advance
Dennis

hi ogawa,
This link would give you more information
http://en.wikipedia.org/wiki/Enterprise_application_integration#Purposes_of_EAI
Regards
Ramesh P

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