  The first 100 brightest eclipsing systems from the Small Magellanic Cloud
were studied for their period changes. The photometric data from the surveys
OGLE-II, OGLE-III, OGLE-IV and MACHO were combined with our new CCD
observations obtained using the Danish 1.54-m telescope (La Silla, Chile).
Besides the period changes the light curves were also analysed using the
program PHOEBE, which provided the physical parameters of both eclipsing
components. For 14 of these systems the additional bodies were found, having
the orbital periods from 2 to 20 yr and the eccentricities were found to be up
to 0.9. Amongst the sample of studied 100 brightest systems, we discussed the
number of systems with particular period changes. About 10 per cent of these
stars show eccentric orbit, about the same numbers have third bodies and about
the same show the asymmetric light curves.
