To understand and to control of wetting and dewetting processes of the solid material by the liquid are of great importance for technological applications under microgravity as well as microscale conditions. The present WG has been interested in this phenomenon accompanying with the surface deformation and the movement of the boundary line of solid-liquid-gas three phases ('contact line'), and has carried out collaborating research on this topic through experimental and numerical approaches. The main objectives of this WG are on developing technologies of liquid/fluid handling in the partially-wet system, and of environment controls under microgravity conditions.