Data migration from 4.7 system to ECC 6.0

Hi All,
I am a Solution Architect. Currently working on a typical pursuit requirement. the requirement is as below:
One of our customer is currently on SAP 4.7 system. Their current system is shared by 2 companies & the companies got demerged now. Hence they are palnning for fresh ECC 6.0 implementation & migrating Master data & transactional data related to this customer from the current 4.7 system to ECC 6.0.
I am seeing possible way for data migration is through ALE or LSMW. But I am not confident about the execution plan & process.
I would wish to know from you people is:
1. The different methods to do data migration from 4.7 to ECC 6.0 with pros & cons
2. How to plan for data migration
3. Risks & mitigations during data migration
4. different kind of skill set & duration required to accomplish this requirement
Currently we are planning for 6 months for the ECC 6.0 core modules implementation.
If you have undergone this kind of project then request you to share your experience. Any information on this regard is appreciated.
Thanks & Regards,
Suresh

Hi
Go through eh below link for Best Practices
http://help.sap.com/bp_hcmv1600/HCM_US/HTML/master_data.htm
[Risk Factors|http://www.informatica.com/INFA_Resources/article_sap_netweaver_mag_data_migration.pdf]
[Different Methods|http://www.sap-img.com/general/what-are-the-methods-to-migrate-data-from-a-legacy-system-to-sap.htm]
[Best Practices|http://partners.netapp.com/go/techontap/NGS_migration.pdf]
Regards
Pavan

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