Local Group versus Nearby Groups -- Local Group(s) -- The Local Group Dwarfs Compared -- Galaxy Groups in the Local Volume: An HI Perspective -- HI in Local Group Analogs: What does it Tell Us about Galaxy Formation? -- Stellar Metallicities and Ages in Leo I dSph -- Globular Clusters in M31 and the Local Group -- Properties of RR Lyrae Stars in the Inner Regions of the Large Magellanic Cloud. II. The Extended Sample -- Diffuse Ionized Gas in the Dwarf Galaxy DDO 53 -- Groups Searches and Surveys -- Galaxy Group Searches and Surveys -- 10 -- Isolated Compact Groups of Galaxies in the 2dF Galaxy Redshift Survey -- Environmental Effects on Galaxy Evolution Based on the Sloan Digital Sky Survey -- DPOSS II Compact Groups: The EMMI/NTT Survey -- The Low-luminosity Galaxy Population in the NGC 5044 Group -- The Galaxy Evolution Multi-wavelength Study (GEMS) Project -- A Search for Ultra-compact Dwarf Galaxies in the NGC 1023 Group of Galaxies -- Dwarf Galaxies in the Antlia Cluster: First Results -- Compact Groups: A Statistical Analysis -- Study of Intracluster Diffuse Light within the Fornax Cluster -- BVRI Photometric Analysis for the Galaxy Group NGC 4410 -- Photometric and Kinematical Study of Nearby Groups of Galaxies Around IC 65 and NGC 6962 -- Evolution of Galaxies in Groups - Observational -- The History of Galaxy Formation in Groups: An Observational Perspective -- Deep Optical Imaging of ESO 383–45: A Galaxy Undergoing Ram-pressure Stripping, or a Tidal Merger Remnant? -- Morphologies and Star Formation in z ~ 0.5 Group Galaxies -- Formation and Evolution of Early-type Galaxies -- Dwarf Galaxies in Hickson Compact Groups -- Low Luminosity Activity in Hickson Compact Groups -- Dwarf Elliptical Galaxies in Cen A Group -- Stellar Populations in Compact Group Elliptical Galaxies -- Spitzer 4.5 ?m Luminosity-Metallicity and Mass-Metallicity Relations for Nearby Dwarf Irregular Galaxies -- Shapes and Galaxy Flows Around Clusters and Groups of Galaxies -- Infrared Surface Brightness Analysis of Galaxies in Compact Groups -- Size and Orientation of the ‘Z’ in ZRGs -- IMF Model Sampling and the Emission Lines in Star Forming Galaxies -- Evolution of Galaxies in Groups - Theoretical -- The Evolution of Galaxy Groups and of Galaxies Therein -- Diffuse Starlight and the Evolution of Groups and Clusters of Galaxies -- Simulating Diffuse Light in Galaxy Clusters -- Lensing by Groups -- The Role of Tidal Interactions in Driving Galaxy Evolution -- Chemical and Photometric Evolution of NGC 6822 in a Cosmological Context -- Evolution of the Luminosity-Metallicity-Stellar Mass Correlation in a Hierarchical Scenario -- Evolution of Groups as Systems -- Groups: The Rich, the Poor and the Destitute -- The Eridanus Supergroup -- ClG J1205+4429, the Most Distant Fossil Group at z=0.59 -- Past and Future of CG J1720-67.8: Constraints from Observations and Models -- The Optical and Near-infrared Properties of Nearby Groups of Galaxies -- Halo Shapes, Dynamics and Environment -- II Zwicky 23 and Family -- Dynamical Analysis of NGC 5128 and the Centaurus Group -- Seyfert’s Sextet (HGC 79): An Evolved Stephan’s Quintet? -- Interstellar Medium and Intragroup Medium -- The HI Content of a Sample of Groups with Different Dynamical Ages -- Neutral Hydrogen in Galaxy Groups -- Environmental Effects on Clusters at z=0.2: Strong Galaxy Disruption in A2667 and A1689 -- Metallicity Structure in X-ray Bright Galaxy Groups -- An X-ray View of the Cores of Galaxy Groups: Effects of AGN and Mergers on the IGM -- Active Galaxies, Thermal Conduction and Entropy of Gas in Galaxy Groups and Clusters -- Stellar and Ionized Gas Kinematics of Peculiar Virgo Cluster Galaxies -- ISM of Galaxies in Extremely Different Environments: Isolated vs Compact Groups -- Comparing Semi-Analytical and Numerical Modelling of the ICM Chemical Enrichment -- Groups in a Cosmological Context -- Groups and Clusters of Galaxies in Cosmological Context -- The Association of Compact Groups of Galaxies with Large-scale Structures -- Probing the Environment with Galaxy Dynamics -- The Internal Dynamics of A115 Nearby Cluster of Galaxies -- Dynamics of the Radio–halo Cluster A2744: An Optical Study -- Dynamics and Shape of Brightest Cluster Galaxies.

For every galaxy in the field or in clusters, there are about three galaxies in groups. The Milky Way itself resides in a group, and groups can be found at high redshift. The current generation of 10-m class telescopes and space facilities allows the observation of the members of nearby groups with exquisite detail, and their properties can be correlated with the global properties of their host group. Groups in the local Universe offer us the chance to study galaxies in environments characterized by strong interactions. In the cosmological context, groups trace large-scale structures better than clusters, and the evolution of groups and clusters appears to be related. All these aspects of research on groups of galaxies are summarized in this book written by scientists working in various fields.