Resonances and $\Theta$-production mechanisms

After explaining the necessity for exotic hadrons, we discuss mechanisms which could account for the production of the exotic $\Theta$-baryon. A possible important role of resonances (producing the $\Theta$ in real or virtual decays) is advanced and emphasized for selected processes. Promising experimental investigations of such resonances, and the $\Theta$ itself, are suggested. We also briefly discuss recent negative results regarding the $\Theta$-baryon.