This book is a compilation of the state-ot-the-art tools for the analysis of population dynamics (growth, mortality, production, consumption, assimilation, respiration) in benthic invertebrates. It is an attempt to systemise our present knowledge and to pass it on to the next generation of scientists. The handbook deals with- the models used to describe population processes,- the analytical tools used to apply these models to data, and- the data required for using these tools.Most of the models introduced here are quite simple, and surely well known to many readers. Rather basic calculation tools and mathematical abilities are required. Anybody who can handle spread sheets and linear regression will be fine with most tools.