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The form factor of hadronic systems in various forms of relativistic quantummechanics is considered. Motivated by the agreement of the nucleon``point-form'' results with experiment, results for a toy model correspondingto the simplest Feynman diagram are first presented. These ones include theresults for this diagram, which plays the role of an experiment, for thefront-form and instant-form in standard kinematics (q^+=0 and Breit frame), butalso in unconventional kinematics and finally a Dirac's point-form inspiredapproach. Results for an earlier ``point-form'' approach are reminded. Resultsare also presented for the pion charge form factor. Conclusions as for theefficiency of various approaches are given.Comment: 8 pages, 5 figures; invited talk at N*2004, Grenoble, March 24-27  (2004); to be published in the proceedings (World Scientific

Form Factors of Hadronic Systems in Various Forms of Relativistic Quantum Mechanics