Hi Kathy,
I led a migration and focused heavily on assessing the data in the previous system, deciding what to keep and what to shed, and more importantly, what to reconfigure via conversion. For us, the biggest lift was updating a legacy contributions data structure that didn't reflect current business practices. The conversion and mapping process allowed us to reconfigure it all with usability in mind (while accounting for pledge data as Kate mentioned). We also shed, moved, or rebuilt other data types - attributes, relationships, etc. It was a long process, but we gained a lot in terms of clarity and usability. Rather than making a singular data migration plan, we spun up multiple planning docs, held lots of cross-functional user meetings, and adapted as needs arose along the way.
I'd be happy to chat if you'd find it helpful,
Jen
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Jen Holmes
Senior Director, Strategic Services
LACMA
jholmes@lacma.org------------------------------