The contributions of double and multiple parton scattering are sizable in many physics processes at the LHC, especially in the region of low particle transverse momenta.  Studies of double-parton scattering using various final states, i.e. W+dijet, W+J/Psi, Z+J/Psi, double-J/psi and four-jet events, are presented along with measurements of the effective cross section, exploiting the different kinematic configurations of events with the double parton and single parton scattering.