Hi Richard,
Only comment I will make on the ContactT that FirstName and LastName fields should be kept in ContatT table instead of CustomerT table. I believe it would have made more sense. CustomerT keeps the Company, Address, CompanyPhone etc. fields and the ContatT keeps the FirstName, Last Name, PersPhone etc. what do you say?

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Reply from Richard Rost:

That is certainly one way to do it. It's really all up to you. That's the beauty of building your own database. I like to build MY personal databases with ONE primary contact on the CustomerT and then have the flexibility to add additional, unlimited contacts for that customer with a second PersonT (I call it PersonT because I already have a ContactT - to me, contacts represent instances of discussion with that customer). But you could go COMPLETELY relational and have NO people listed in the CustomerT (if your customers are primarily companies). Then have a check box on your PersonT to indicate the primary contact. Again, it's completely up to you.