Sarah Marwan, Teaching Assistant at Faculty of Business Administration at HUE completed PhD in Accounting and information system, the dissertation will be published and handled among Egyptian universities, under the title of “Blockchain technique as a tool for increasing the effectiveness of inter organizational cost management through the Supply chain: an applied study”. the dissertation has been discussed by a committee consisting of four experts (Prof. Samir Abu Elfetouh – professor of Accounting and information system ,Mansoura University , Prof. Ismail Gomaa – former dean and professor of Accounting and information system , faculty of commerce -Alexandria University, Prof.Ahmed Tolba – former dean and professor of computer science , faculty of computer and information sciences – Mansoura university and Prof.Mahmoud Abd El-Fatah , professor of managerial and cost accounting , faculty of commerce – Mansoura University.