Viscoelasticity and temperature dependencies are explained through molecular dynamics and Control Theory, which lead to the development of the Control Theory (CT) and Unified Models. Molecular dynamics related to various flow behaviours and Unified formulas have been modelled and discussed in previous sections. Temperature transformations modelled for flows are discussed in this chapter, summarizing from the original paper[aut]Pääkkönen, E.J.” ( Borg T., Pääkkönen E.J. Linear viscoelastic models. part IV. From molecular dynamics to temperature and viscoelastic relations using control theory. J Non-Newton Fluid Mech 165 (2010) 24–3).