Good PCB  design must accommodate wide variety of preferences,
standards, and practical considerations which all have to be considered and carefully applied.

There are lots of ways to put together a pallet (or panel) of boards.

This can save money when fabricating & assembling the finished product.

Below are some simple examples. 

Click on the pictures to see an enlarged view.

Gold can be appropriate for
surface mount.

This shows "mouse bites", small holes at the edge of the tabs to help break apart the parts.

Also notice the generously sized handling bar and 1st pass non plated tooling hole for automated assembly machines.

These are

tab routed.

The bar on the left allows it to be carried through a wave solder machine while still having parts very close to the final board edge.

Another cram job.

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We've got a BIG library of reference material and catalogs to help you with your PCB design project, from switches and screws to semiconductors
and tubes.

Knowing what parts are available
(and having ALL the dimensions) is critical when laying out a PCB.

Another technique is scoring 

A thin grove is cut so that the boards may be easily broken apart.

It does leave a somewhat ratty edge, but it's less work than cleaning up the little tab route stubs.

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