Information technology consulting; computer and software consultancy services; writing, development, updating and design of computer software; upgrading of computer software; computer software installation and maintenance; updating and adapting of computer programs according to user requirements; consultancy and advice relating to the evaluation, choosing and implementation of computer software, firmware, hardware and of data processing systems; development and project analysis, in particular in the field of information technology and other computer-related technologies; updating memory banks of computers and computer systems; rental and maintenance of computer software; updating of computer software for others; advisory and consultancy services relating to computer hardware, computer software, computer networks