LEAD:
Architect and writer Sarah Susanka, whose "The Not So Big House" books have been hugely successful, has now written "The Not So Big Life". At first it might seem that the jump from design to self-help is a great one, "The Not So Big Life" is in many ways a prequel because before she could write her first six books, she had to change her own life.

RUNS: 6:15


END CUE: "...published by Random House."