Definitely do-able but as Melissa mentioned you'll want to have the process and rules lined out first. That part may take you much longer than the actual technical integration. As Allan mentioned you will need ID fields for all of your various instances (and clear naming conventions to know which points to which). The data mapping and business rules will really define the technical plans, having schematics for lead management workflows, data dictionaries (so you can distinguish what each field means, which systems it integrates with and whether the data types and picklist values being used are congruous across your systems) are going to be the lynchpin to your success in this process. You also want to take into account which of the 3 systems "wins" if there is conflict, there is a very real possibility that records may overlap among your systems so what happens when that is the case? Because of the custom field limitations in Eloqua you need to take a good hard look at your current Eloqua instance to see where you can add in the new data, how it will match up and whether or not you need to consider using custom objects.
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