R 3 Means ( Three tier architechture ) 1st Tier ( R1 )

launched at the time of SAP inception with five x ibm

employees , later on 2 nd & 3 rd tier had come in the form

of advanced . Now latest is My SAP CRM.

R 3 actual Nomeneclature is ( ECC - Enterprenuer Central

Component )

CRM acts as a central server attached to its external

systems such as ( BIW , ECC & Third party systems , etc ).

Eg : If a client has already had installed SAP ECC ( R3 )

and wants to upgrade with SAP CRM , in this scenario , we

have to integrate or fetch some data related to Sales ,

Pricing Conditions etc thru R 3 / ECC .

This is done thru middle ware concept ( connectivity ) ,

for which you should posses knowledge on the middleware

concepts