Abstract : Many experiments and applications using cold molecules need to have a sample of molecules cold in all degrees of freedom. My activity in the cold molecule experiment considered several extensions and generalizations of the vibrational cooling technique using a shaped broadband laser. The first extension realized was the transfer of the molecular population to any pre-selected vibrational level. Another extension was the realization of vibrational cooling and molecular population transfer with the use of a broadband, non-coherent, diode light source, instead of a femtosecond laser. Finally, we demonstrate an efficient technique which allows us to convert molecules initially formed in the triplet state (a3Σu+) into the ground electronic state (X1Σg+). The generalization of the vibrational cooling technique to include rotation has also been studied. Preliminary experiments considered for rotational cooling as well as more detail theoretical treatment has been performed. This open the way for more general laser technique apply to molecules.