(1) The project origin arises from the ARGE DONAULANDER - Working Group of spatial planning (ARGE) where since 1993 the idea of the Concept of the cooperation of the Danube regions, cities and ports was permanently developed. Up to now the common methodological model was elaborated and approved by the ARGE members. (2) The model consist of Three phases. Each phase is divided into four sectoral general scheme namely sectors of (a) Environment, (b) Settlement Structure & Human Resources, (c) Transport &Technical infrastructure and (d) Economy. Each phase ends with integration of particular sectoral aprroaches. (3) According the ARGE plan the Donauregionen project, which was implemented in InterregIIIB CADCES programme represents the 1st -analytical phase. (4) The project Donauregionen+ represents the 2nd - synthetical phase with Joint Danube Regions Development Strategy (D+ strategy) as main project objective. (5) The 3rd - implemntation phase, the last one according present ARGE methodological model will be Donauregionen++ project, with the support of implementation of the D+Strategy in the planning of involved Danube regions, cities and ports. (6) As communication and information tool an INFORM-ARGE has been setup. As its 1st phase PHARECBC/Interreg IIC project Donaudatenkatalog was implemented. The project has developed a metainformation system of available data sources for planning activities in Danube space. This was further updated in Donauregionen project supported also by development of GIS.