We have performed a photometric observational program to obtain precise
uvby and 
light curves of late-type main-sequence detached
binary systems. The accuracy of the photometry, evaluated as the dispersion
of the discrepancies in the magnitudes and indices for the standard stars,
is estimated at a few millimagnitudes.
In this paper we have presented the first complete 
photometric
light curves for ZZ UMa. The comparison stars used showed no variability.
We have presented also uvby and 
photometry for
the standard stars observed in the program, and details about the
standard transformation procedure.
Acknowledgements
The 1.5 m telescope at Calar Alto is operated by the Observatorio Astronomico Nacional. The 0.5 m telescope at La Silla is operated by the Copenhagen Group. The 1 m telescope at Sierra Nevada is operated by the Instituto de Astrofísica de Andalucía. We want to express our gratitude to the observatories staff. This work has been supported by the Spanish Comision Interministerial de Ciencia y Tecnologia (PB90-0001-C02).