If in doubt about what to do next, keep yourself busy by going around and changing all the name plates: in a move scarcely calculated to do much to restore battered confidence in the company, IBM Corp’s shrunken Cadam Inc, the Burbank, California company that now confines itself to the microcomputer versions of the computer-aided design software, has changed its name to Altium, effective immediately: it says the Altium name is part of its plan to secure the unit’s position in the desktop market and a part of the larger renewal of IBM.