What is the proper way to prune black raspberries in late winter/early spring?

Question:

What is the proper way to prune black raspberries in late winter/early spring?

Answer:

In March or early April, remove all small, weak canes, leaving only 4 or 5 of the largest, most vigorous canes per clump or plant.  Cut back the lateral (side) branches to 12 inches in length.