One can gain valuable insight in processes controlling multiphase flow and transport in porous media through theoretical and/or experimental study of these processes at the pore scale. Theoretical tools such as pore-scale network models, lattice Boltzman models, percolation models, and smoothed particle hydrodynamics have been extensively used to study such processes. Also, in recent years, an increasing amount of work has been done to quantify various aspects of flow and transport in porous media with different imaging techniques. For this special session, we seek contributions from ongoing research involving pore-scale computational tools and imaging techniques for the study of multiphase flow and/or transport of solutes and/or (bio)colloids in porous media. We are particularly interested in how links are made between observations and computational models, how micro-scale observations can be related to macro-scale properties, and more importantly, how reliable and/or accurate the different imaging methods are.