The paper presents a full original method to determine the viscoelastic parameters of laminated composites. The test program comprises isothermal testing at room as well as at elevated temperature of the different laminated composites. The aim is to test the material over a period of 10 hours in the laboratory, as a result of which the material parameters such as creep compliance can be measured. The information can be utilized to make a rather exact prediction of the mechanical behavior over considerably longer times of say years or even tens of years, which is almost impossible to determine otherwise, due to the limited experimental possibilities.