We present a comprehensive VLA and ALMA study of the SVS 13 protobinary system (projected separation = 90 au) in NGC 1333. From our observation of dust, molecular, and ionized emission, we have derived the physical properties of the system and inferred chemical abundance variations on
scales on the order of 10 au. We have imaged the jet, studied the 3D kinematics of the system, and measured the orbital motion of the two protostars and derived their masses. We have obtained images and the physical properties of two small circumstellar disks (radii of 10-12 au) and of a still-forming circumbinary disk with prominent spiral arms extending up to about 500 au.