Hi, I'm Arosh. In last few days I go through the Google API and find out the component features and the data model of it. I think this should be the correct project to me for this summer.Because I am a Sun Certified Java Programmer and four to five years experience with Java. Also I have the experience of working with several APIs.In last 6 months I working with mobile APIs like Android and Brew, WAP frameworks like mymobileweb and netbiscuits and also JSF ect. So before I further researching on these projects I think it is very much important to have a strong understanding about XWiki data model.I would like to know what are the relevant steps should I take to make my interest a reality. Further I would like to know what are the weakness that was there in old calender specifically. -- regards Arosh Thilanka Perera Dpt of Computer Science & Engineering University of Moratuwa Sri Lanka.