  New high-resolution adaptive optics systems provide an unprecedentedly
detailed view of nearby star forming regions. In particular, young nearby T
Tauri stars can be probed at much smaller physical scales (a few AU) than
possible just a decade ago (several tens of AU). Of major importance is closing
the sensitivity gap between imaging and spectral surveys for stellar
companions. This allows for 1) calibration of pre-main-sequence evolutionary
tracks by obtaining accurate dynamical masses, 2) resolving confusion problems
arising by placing unresolved systems in colour-magnitude diagrams, and 3) well
defined and determined multiplicity fractions of young stellar systems,
important for discriminating star formation scenarios. This article briefly
reviews the current status of high resolution imaging of T Tauri multiple
systems, and what we can expect to learn from them in the near future.
