  The paper has two goals:
  It presents basic ideas, notions, and methods for reduction of reaction
kinetics models: quasi-steady-state, quasi-equilibrium, slow invariant
manifolds, and limiting steps.
  It describes briefly the current state of the art and some latest
achievements in the broad area of model reduction in chemical and biochemical
kinetics, including new results in methods of invariant manifolds, computation
singular perturbation, bottleneck methods, asymptotology, tropical
equilibration, and reaction mechanism skeletonisation.
