Current theories of hierarchical structure formation 
predict that small galaxies are the building blocks of larger ones. 
Therefore dwarf galaxies are arguably the surviving remanents of this process.
A detailed dynamical and chemical study of individual stars in nearby systems 
is thus an important step to accurately model the evolutionary history 
of all galaxies and the contribution of small galaxies to the 
assembly of larger galaxies.
As part of the DART project we have used FLAMES at the VLT to obtain 
intermediate resolution spectra in the Calcium triplet region for hundreds 
of stars out to several core radii for a representative sample of 
dwarf spheroidal galaxies around the Milky Way. In addition to 
accurate kinematic information, we determine [Fe/H] for 
each observed star using the equivalent widths of the 
CaII triplet lines. 
In this talk I will give an overview of the DART photometric and 
spectroscopic survey of Sculptor and Fornax dSph, describing 
the metallicity and kinematic properties of these systems.
I will then focus on results from the kinematic modelling of Sculptor 
dSph, aimed to derive the mass content of this object 
and test predictions from dark matter models.