  Large-format (sub)millimeter wavelength imaging arrays are best operated in
scanning observing modes rather than traditional position-switched (chopped)
modes. The choice of observing mode is critical for isolating source signals
from various types of noise interference, especially for ground-based
instrumentation operating under a bright atmosphere. Ideal observing strategies
can combat 1/f noise, resist instrumental defects, sensitively recover emission
on large scales, and provide an even field coverage -- all under feasible
requirements of telescope movement. This work aims to guide the design of
observing patterns that maximize scientific returns. It also compares some of
the popular choices of observing modes for (sub)millimeter imaging, such as
random, Lissajous, billiard, spiral, On-The-Fly (OTF), DREAM, chopped and stare
patterns. Many of the conclusions are also applicable other imaging
applications and imaging in one dimension (e.g. spectroscopic observations).
