This paper describes the construction and use of a comprehensive tool for enterprise modeling, MEMO4ADO, implemented using the meta modeling environment ADOxx. MEMO4ADO offers an extensible set of editors for various modeling languages. The paper gives an overview of the tool's architecture and describes the integration of modeling languages and diagrams. A use case serves to illustrate the design and analysis of enterprise models with MEMO4ADO. The paper concludes with a brief assessment and an outlook on the further development of the tool.