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Many of the examples of above are of the type: A subsystem (or chromophore) interacts with an environment, which leads to energy and phase relaxation in the system. These system-bath problems can be treated in various ways. In quantum dynamics, we often use reduced density matrix theory, by solving an open-system Liouville-von Neumann (LvN) equation either with or without the Markov approximation and by direct matrix propagation. LvN equations can also be solved by stochastic wave- packet methods instead. An alternative approach is the solution of the full system-bath, time-dependent Schrödinger equation, by approximate quantum wavepacket methods. Examples are the MCTDH (Multi-Configurational Time-Dependent Hartree), the LCSA (Local Coherent State Approximation), and TDSCF (Time-Dependent Self-Consistent-Field) methods. Further, quantum-classical dynamics or molecular dynamics with friction (Langevin dynamics), can be employed. Method-oriented examples of our work are (numbering refers to publication list):