Advisory services relating to computer software; computer software advisory services; computer software consultancy; computer software design; computer software development; computer software engineering; computer software programming services; consultancy in the field of computer software; design and development of computer software (for others); design of computer software; development of computer software; development of computer software application solutions; diagnosis of faults in computer software; installation and maintenance of computer software; installation of computer software; maintenance of computer software; writing of computer software