  The central aspect of my personal scientific activity, has focused on
calculations useful for interpretation of High Energy accelerator experimental
results, especially in a domain of precision tests of the Standard Model. My
activities started in early 80's, when computer support for algebraic
manipulations was in its infancy. But already then it was important for my
work. It brought a multitude of benefits, but at the price of some
inconvenience for physics intuition. Calculations became more complex, work had
to be distributed over teams of researchers and due to automatization, some
aspects of the intermediate results became more difficult to identify.
  In my talk I will not be very exhaustive, I will present examples from my
personal 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 amplitudes
for (ii) e+ e- to 4f and for (iii) e+ e- to nu_e bar nu_e gamma gamma
processes, (iv) phenomenology of CP-sensitive observables for Higgs boson
parity in H to tau+ tau- , tau+- to nu 2(3)pi cascade decays
