Technical Services Units:
You need only one MFHD and one Item record when you have all of the following:
a single location
the same classification number
a single copy
You need only one MFHD but more than one Item record any time there is more than one piece to barcode. This includes any time you have either of the following:
more than one format in one location
more than one volume in one location
You need multiple MFHD and Item records when you have any of the following:
more than one location
more than one classification number
more than one copy
The number of volumes does not affect the number of MFHDs.
Every piece that has a barcode will require a separate Item record.