  This paper aims to give a brief review of a new concept for the preliminary
determination of the evolutionary status of supernova remnants (SNRs). Data
obtained by radio observations in continuum are used. There are three different
methods underlying the new concept: the first one based on the location of
observationally obtained radio surface brightness and corresponding diameter of
an SNR on the theoretically derived Sigma-D tracks; the second one based on the
forms of radio spectra; and the third one, based on the magnetic field
strengths that are estimated through the equipartition (eqp) calculation. Using
a combination of these methods, developed over the last two decades by the
Belgrade SNR Research Group, we can estimate the evolutionary status of SNRs.
This concept helps radio observers to determine preliminarily the stage of the
evolution of an SNR observed in radio domain. Additionally, this concept was
applied for several SNRs, observed by the Australia Telescope Compact Array
(ATCA), and the corresponding results are reviewed here. Moreover, some of the
results are revised in this review to reflect the updated recently published
Sigma-D and eqp analyses.
