  In this report we give a detailed account on Hanbury Brown/Twiss (HBT)
particle interferometric methods for relativistic heavy-ion collisions. These
exploit identical two-particle correlations to gain access to the space-time
geometry and dynamics of the final freeze-out stage. The connection between the
measured correlations in momentum space and the phase-space structure of the
particle emitter is established, both with and without final state
interactions. Suitable Gaussian parametrizations for the two-particle
correlation function are derived and the physical interpretation of their
parameters is explained. After reviewing various model studies, we show how a
combined analysis of single- and two-particle spectra allows to reconstruct the
final state of relativistic heavy-ion collisions.
