The complex formation in the oppositely charged linear and flexible polyelectrolytes : quaternized poly(vinylpyridinium) (QPVP) and poly(sodium styrenesulfonate) (NaPSS) was investigated by static and dynamic light scattering (LS), flow birefringence (FB), and viscometry over a wide range of mixing ratios 0.003 less than or equal to m less than or equal to 0.9. NaPPS/QPVP systems in N-methylformamide + 0.01 M KBr generated complexes with fractal geometries. The observed clusters were stable and had average dimensions R-g approximate to R-h approximate to 1000 Angstrom at low and high mixing ratios. As the mixing ratio approached m = 0.4, which corresponds to the gel point, the number and the dimensions of clusters grew to R approximate to 1500-3000 Angstrom with a corresponding increase of the fractal parameter d approximate to 3. According to FB data, the axial ratio of the clusters at the gel point m = 0.4 was p = L/d = 1.07, which supports a model with spherical shape.