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Results from the modelling of bars in nearly 300 galaxies are used to testpredictions from theoretical work on the evolution of bars. Correlations arefound between bar ellipticity and boxiness, between bar strength and normalisedsize, between the normalised sizes of bars and bulges, and between normalisedbar size and bulge-to-total ratio. Bars with different ellipticities followparallel lines in the latter two correlations. These correlations suggest that,formed with different sizes and ellipticities, bars slow down and grow longerand stronger, in agreement with theoretical work. As a consequence, bar patternspeeds should become lower with time, and towards galaxies with more prominentbulges.

The Evolution of Bar Pattern Speed with Time and Bulge Prominence