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Practically there's no 100% migration path from 10g to 11g R2. Architecture has been changed. Migration also depends on the existing implementation i.e. 10g implementation.
First evaluate what are the existing components which can be migrated directly and what all you'll have to develop from scratch. Also evaluate the time estimation for two cases:
1. Time estimation for Migration
2. Time estimation if you start implementing your requirements from scratch
Compare both and go ahead with your decision.