The models in structured families correspond to the treatments of a fixed effects base design <InlineEquation ID="IEq1"> <EquationSource Format="TEX">$$\pi $$</EquationSource> </InlineEquation>. Then the action of factors in <InlineEquation ID="IEq2"> <EquationSource Format="TEX">$$\pi $$</EquationSource> </InlineEquation>, on the fixed effects parameters of the models, is studied. Analyzing such a families enables the study of the action of nesting factors on the...</equationsource></inlineequation></equationsource></inlineequation>