  The article provides a brief general introduction into the concepts of
scaling, universality, and crossover scaling, plus the blob concept that
provides an intuitive picture of crossover phenomena. We present the most
important static and dynamic scaling laws for unentangled uncharged polymer
solutions, together with their test and refinement by careful computer
simulations. A hoard of simulation methods has been developed for these
systems, and these will be briefly discussed as well.
