Features of the Quark Gluon Plasma (QGP) - the collective phase of QCD - have since the nineties been measured and interpreted in terms of macroscopic hydrodynamic models. Since LHC has presented evidence that QGP are also present in small systems, it is relevant to ask if the collective features can be described without assuming a QGP in thermal equilibrium, but rather from microscopic models.
In this talk work done towards establishing such a model, on the basis of the Lund string hadronization model, is presented, along with its consequences for observables already measured at the LHC.