An overview of the contributions made at the Particle Technology Forum in the general context of multiphase Row research is presented. Recent developments in the measuring and computational simulation techniques have made significant inroads in the field. There is an increased interest on basic two-phase flow mechanisms, particularly for dense suspension Rows. The numerical simulations are more sophisticated and closer to industrial design and applications. Rapidly changing technologies provide support for the non-intrusive instrumentation and on-line technology for two-phase flow. The necessity to combine experimental, theoretical and numerical simulation techniques in most research projects has highlighted the importance of a broader university Education and the use of interdisciplinary research teams. Several open research issues have been identified.