If you uncheck this option, IdentityIQ will generate an NCD event for every account, regardless of whether any changes were made to the target account. This means that the number of NCD events triggered will correspond to the total number of accounts you have and multiply them by no. of times you run the aggregation for that source. For example, if you have 1,000 accounts but only 50 of them have changes, you would expect to see just 50 NCD events, but with this unchecked, you’ll end up with 1,000 events. If you run this aggregation 5 times a day, you’ll end up with 5,000 events instead of 250. I hope that helps.