Pls send me blogs/ppt/docs ?
check following link .
Start yours presentaion with explaining about SOA concepts and what is the roles of webservices in SOA ,Then explain about Enterprise Services,What is Enteprise Services and how to use enterprise services,and explain about Sevice Registrty role in SOA.
THEN START explaning about how PI7.1 chnaged accroding to ESOA architecture,and explain some concepts like Global data types,service interfaces concept…How to use sertvices in PI,and how to consume the services and publish the services…
prepare your presentation like that..
REFER BELOW LINK
ABOVE LINKS explain about ESOA,and the role ESOA in PI,prepare the presenattion using the documents..