The assignments of resonances (3/2)-,(1/2)- and (7/2)+ within the multiplets of S?(12) andtheir strong-decays are discussed. It is found that the ((1/2)++0-) decay modes of the (3/2)- particles belonging to the multiplets 16016 and 35100 are forbidden. By redefining the parity of the representations by changing the sign of the massterms in the wave-equations, it is possible to assign the particles ((3/2)-,8) and ((1/2)-,1) in the representation 572. However,the decays of ((3/2)-,1) and (7/2)+ particles through an effective vertex with S?(12) symmetryare still forbidden. The success and failure of S?(l2) in the problem of classification and strong-decays of elementary particles are analysed and discussed in detail.