Authenticating works of art; Biological research; Calibration; Chemistry consultation; Computer programming; Computer software consultancy; Computer software design; Computer systems analysis; Construction drafting; Conversion of data or documents from physical to electronic media; Creating and maintaining web sites for others; Design of interior decor; Engineering; Geological research; Hosting the web sites of others on a computer server for a global computer network; Industrial design; Installation of computer software; Land surveying; Maintenance of computer software; Material testing; Oil-field surveys; Packaging design; Provision of search engines for the Internet; Quality control for others; Rental of web servers; Research in the field of chemistry; Research in the field of environmental protection; Technical advice relating to operation of computers; Technical consultancy in the field of environmental science; Technical consultation in the field of environmental science, engineering services, design for others in the field of energy engineering, designing and testing of energy products for others; Technical consulting in the field of pollution detection; Technical writing for others