Planning and implementing projects in the field of information processing; computer consultant service, in particular, for projects in the field of information processing; computer system analysis; rental and leasing of computer programs and software, also in the form of printed documents; planning and development of data processing systems; planning and monitoring of the introduction as well as modification of data processing systems; consulting service with the introduction and modification of data processing systems; production and maintenance of data processing programs; development of data processing programs for third parties