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The central aspect of my personal scientific activity, has focused oncalculations useful for interpretation of High Energy accelerator experimentalresults, especially in a domain of precision tests of the Standard Model. Myactivities started in early 80's, when computer support for algebraicmanipulations was in its infancy. But already then it was important for mywork. It brought a multitude of benefits, but at the price of someinconvenience for physics intuition. Calculations became more complex, work hadto be distributed over teams of researchers and due to automatization, someaspects of the intermediate results became more difficult to identify.  In my talk I will not be very exhaustive, I will present examples from mypersonal research only: (i) calculations of spin effects for the process e+ e-to tau+tau- gamma at Petra/PEP energies, calculations (with the help of the{\tt Grace} system of Minami-tateya group) and phenomenology of spin amplitudesfor (ii) e+ e- to 4f and for (iii) e+ e- to nu_e bar nu_e gamma gammaprocesses, (iv) phenomenology of CP-sensitive observables for Higgs bosonparity in H to tau+ tau- , tau+- to nu 2(3)pi cascade decays

Automated calculation of matrix elements and physics motivated observables