Electroweak Symmetry Breaking : By Dynamically Generated Masses of Quarks and Leptons With this thesis the author contributes to the development of a nonmainstream but long standing approach to electroweak symmetry breaking based on an analogy with superconductivity. Electroweak symmetry breaking is assumed to be caused by dynamically generated masses of typical fermions i.e. of quarks and leptons which in turn assumes a new dynamics between quarks and leptons. Primarily it is designed to generate fermion masses and electroweak symmetry breaking is an automatic consequence. the summary of the topic the first main part of the thesis addresses the question as to whether the masses of known quarks and leptons provide sufficiently strong sources of electroweak symmetry breaking. It is demonstrated that neutrino masses subject to the seesaw mechanism are indispensable ingredients. The other two parts of the thesis are dedicated to the presentation of two particular models: The first model is based on the new strong Yukawa dynamics and serves as a platform for studying the ability to reproduce fermion masses. The second more realistic model introduces a flavor gauge dynamics and its phenomenological consequences are studied. Although interest in this type of model has waxed and waned over the years following the discovery of the Standard Model like Higgs particle it is regaining its relevance. Although interest in this type of model has waxed and waned over the years following the discovery of the Standard Model like Higgs particle it is regaining its relevance. Although interest in this type of model has waxed and waned over the years following the discovery of the Standard Model like Higgs particle it is regaining its relevance