Latest since the early eighties destandardisation of employment became a term of wide comprehension. Especially in Germany the once predictable employment biography would have been dissolving for an occupational career with phases of unemployment and many job changes. Employment careers are seen to be more heterogeneous, former guaranteed securities would have been broken and working future would be no more predictable. By means of a longitudinal dataset on the basis of the German Socio-economic panel covering the years 1985 to 2000 this dissertation is showing that the destandardisation of work in West Germany is first beginning in the middle of the nineties. This is reflected in the increase of flexibilisation, the reduction of job stability (quantitative dimension) and the decrease of job security (qualitative dimension). These developments do not affect the collectivity of the work force. In the course of time a polarisation of social unemployment is arised along occupational classes and levels of education.