things they dealt / the things they dealt with ''Then, when the fraud thing became my primary concern, obviously I had to get involved much more because it had to do with things they dealt with on a daily basis: money.'' Is my assumption right? The users dealt with a variety of things and the fraud had to do with just one of them: money. Choosing the then means that the fraud had to do with all the things users dealt with And it would be more appropriate to say: ''It had to do with the thing they dealt with on a daily basis: money.''