You buy a cable, plug in the modem, and that's the end of it. Part one deals with the interface, reasons for an interface standard, and the general concepts and tools needed to attack an interface problem.
Some notes are odd, however.
Read carefully, it indicates that IBM was right, but it may confuse some readers. Those who want the full technical details of the interface specification will have to get them elsewhere. Few will want as much detail on printers as is given here. For those hobbyists truly interested in the interface, this is an intriguing, and potentially quite useful, source.