Function Module and BADI and bapi

Could u explain

disadvantages of Function Module?

disadvantages of BADI?

disadvantages of BAPI?

disadvantages of SMART FORMS?

these are all my IBM questions...i am not able to answer to these questions so could u help me?

https://wiki.sdn.sap.com/wiki/display/HOME/Rules ofEngagement]>

Edited by: Mike Pokraka on Aug 12, 2008 10:26 AM