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We analyse the consequences of the usual assumption of a constant function tofit non-resonant decays from experimental Dalitz plot describing charmed mesondecays. We first show, using the $D^+\to \bar{K}^0\pi^+\pi^0$ decay channel asan example, how an inadequate extraction of the non-resonant contribution couldyield incorrect measurements for the resonant channels. We analyse how thecorrect study of this decay will provide a test for the validity offactorization in D meson decays. Finally, we show how form factors could beextracted from non-resonant decays. We particularly discuss about the formfactor that can be measured from the $D^+_s\to \pi^-\pi^+\pi^+$ decay. Weemphasize on its relevance for the study of the decay $\tau \to \nu_{\tau}3\pi$ and the extraction of the $a_1$ meson width.Comment: 14 pages, Latex including 6 eps figure

Phenomenological analysis of nonresonant charm meson decays