Introduction Chapter I Banach modules, $L^/infty$ spaces 1 Banach modules 2 $L^/infty$ spaces 3 Integration Chapter II Relative injectivity and amenable actions 4 Relative injectivity 5 Amenability and amenable actions Chapter III Definition and characterization of continuous bounded cohomology 6 A naive definition 7 The functorial characterization 8 Functoriality 9 Continuous cohomology and the comparison map Chapter IV Cohomological techniques 10 General techniques 11 Double ergodicity 12 Hochschild-Serre spectral sequence Chapter V Towards applications 13 Interpretations of $(^2 /rm EH)rm cb)$ 14 General irreducible lattices Bibliography Index