Abstract
For phenomenology of High Energy Physics experiments, Known Physics and New Physics phenomena, predictions need to be available. One has to take into account results of diverse research activities. On experiments side this includes control of detector acceptance and its response details, also observable definitions and different types of background subtractions. On theoretical side one needs to keep in mind results on: higher order matrix elements calculations, structure functions, evolution kernels, Monte Carlo and/or semi-analytic integration algorithms, algebraic manipulation programs. I will not address foundations of Yennie-Frautchi-Suura exclusive exponentiation, or of factorizations used in QCD. That would be too broad a subject, obscuring the main purpose of my talk. I will concentrate on the investigation of spin amplitude gauge invariant parts and how they were useful in case of my work.
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