You might want to consider reviewing the Criteria Sets within your template or your Default Criteria Set. Criteria Sets tell Importacular what fields to match on from within Raiser’s Edge. Each Criteria Set can be arranged in order so that Importacular knows which Criteria Set to look at first and then next and so on.
You can also adjust your Criteria Sets to how strict they should be applied: Exact, Good or Poor. Exact and Good settings will return records with a status of ‘Update’ in your Data Review Screen. A ‘Poor’ setting will produce ‘decides’ in your Data Review Screen.
The more fields you include in each of your Criteria Sets, the more precise the matching will become, but you will increase the probability that Importacular will not find an Exact or Good match, thus producing more records to ‘create’ or more records to make decisions on.
The fewer fields you include in each of your Criteria Sets, the less precise the matching will become, and might increase the number of ‘decides’ that Importacular asks you to consider (if set to ‘Poor’) or the wrong records being updated.
Criteria Sets are a balancing act based on the nature of your data in RE, the data you are trying to import and the amount of time you are willing to spend on the Data Review Screen. Though Zeidman can help you figure this out, you are the best person to know and understand what balance to strike with your data.