The principal activity of the company is the development and marketing of optimisation and visualisation software as reusable components. the company provides 3 ranges of products: ilog optimisation products enabling users to develop powerful resource optimisation, scheduling and logistics planning applications; Ilog visualisation products providing a set of tools to help user interface development across windows and unix platforms, facilitating the development of business graphic objects for professional applications in c++ and java; Ilog rules products providing c++ and java components for structured data distribution and filtering used in applications such as network management, process monitoring and fraud detection. these products are used in telecommunications, manufacturing, transportation and defence. licences accounted for 66% of fiscal 2001 revenues and services 34%.