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Using ideas underlying the flavour-blind "Nijmegen Unitarised Meson Model" wetry to understand on the basis of a system of Schroedinger equations with onemeson-meson and one (spinless) quark-antiquark channel coupled by a simpledelta-shell transition potential the formation of (e.g. scalar) meson-mesonscattering singularities in the complex momentum and energy plane. Surprisinglywe are able to describe without direct meson-meson interaction and without anyneed for glueballs the whole known scalar meson spectrum. "Light" scalar mesons(e.g. f0(600), kappa(800), f0(980), a0(985), D*0(2290), ...) are identified tobelong to the spectrum of the transition potential, while "heavy" scalars (e.g.f0(1370), K*0(1430), f0(1500), f0(1710), a0(1450), D*0(2621) (?), D*0(2825)(?), D*sJ(2928) (?), ...) are related to the confinement spectrum. Due to theparticular value of the charm-strange reduced quark mass level-(anti)crossingin the complex momentum plane occurs which relates the BABAR state Ds(2317) tothe bare groundstate of the confinement spectrum, while the respectivegroundstate of the transition potential ends up as D*sJ(2782) (?). We concludewith a short comment on (our) recent progress in the consistent quantum fieldtheoretical effective description of resonances within a Lagrangian framework.Comment: 5 pages, 1 figure consisting of 4 eps-files; contribution to the 10th  Int. Conference on "Hadron Spectroscopy" (HADRON '03), Aschaffenburg,  Germany, 31.8.-6.9.200

The Light and Heavy Scalars in Unitarized Coupled Channel and Lagrangian Approaches