42 Design, development, maintenance, updating, installation and implementation of computer software; computer system design; design and development of on-line computer software systems; computer system analysis; maintenance of computer hardware systems; updating, installation and implementation of computer software for computer systems; design of computer systems for use in analysing, monitoring, controlling, modelling and optimising industrial process performance and safety; design and development of on-line computer software systems for use in analysing, monitoring, controlling, modelling and optimising industrial process performance and safety; analysis of computer systems for use in analysing, monitoring, controlling, modelling and optimising industrial process performance and safety; maintenance of computer hardware systems for use in analysing, monitoring, controlling, modelling and optimising industrial process performance and safety; updating, installation and implementation of computer software for computer systems for use in analysing, monitoring, controlling, modelling and optimising industrial process performance and safety; design of computer systems for use in fault detection; design and development of on-line computer software systems for use in fault detection; analysis of computer systems for use in fault detection; maintenance of computer hardware systems for use in fault detection; updating, installation and implementation of computer software for computer systems for use in fault detection; computer programming; engineering; provision of information, advice and consultancy services relating to all the aforesaid