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This paper discusses the current uncertainties in luminosity calibration ofthe RR Lyrae variables. The difference in distance moduli between the SMC andLMC as derived from RR Lyrae stars and classical Cepheids is used to estimate ametallicity effect on the Cepheid PL(VI) relation of 0.29+-0.11 mag/dex. Thereis evidence that suggests RR Lyrae variables and type II Cepheids share acommon K-log(P) relation. Metallicity and age gradients in the LMC arediscussed from data on RR Lyrae variables and AGB stars.

RR Lyraes and Type II Cepheids in the Magellanic Clouds: Distance Scales and Population Gradients