explain classes involved in SSIS programming

There are many classes involved in SSIS programming. Their relationships, usages and programming are not intuitive to me and hard for me to comprehend. Does anybody know if there is some good articles explaning all these?

thanks

[238 byte] By [YanbingHu] at [2007-12-16]
# 1
The object model discussion in BOL does a pretty good job of explaining this. Is there something that you want to know that isn't covered there?
KirkHaselden at 2007-9-9 > top of Msdn Tech,SQL Server,SQL Server Integration Services...

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