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The aspects of the analysis of photometric time-series obtained ondouble-mode or multiperiodic pulsating stars are briefly reviewed. Inparticular, the ratios between frequencies are used to pin cases revealingpeculiarities. In addition to the Petersen diagrams, we also demonstrated thatthe period ratios can detect interesting objects. In particular, new resultsare obtained on High--Amplitude Delta Scuti contained in the OGLE-II database.Comment: Invited review presented at the MinySymposium ``Asteroseeismology and  Stellar Evolution", JENAM, Budapest, 25-30 August 2003 -- To be published in  Communications in Asteroseismology Series, 200

The use of Petersen diagrams and period ratios in investigating the pulsational content of stars in the classical Instability Strip