  Transverse-momentum dependent parton distributions (TMDs) are studied in the
framework of quark models. Results for the six T-even TMDs are obtained from
the overlap of three-quark light-cone wave functions, using both the chiral
quark-soliton model and a light-cone constituent quark model. Furthermore,
quark model relations among TMDs are reviewed and their physical origin is
discussed in terms of rotational-symmetry properties of the nucleon state in
its rest frame.
