Certeso works on the fire safety a building needs once it is occupied rather than while it is being designed: fire prevention dossiers, evacuation plans, fire risk analyses, intervention dossiers, compartmentation advice and the follow-up of fire brigade reports, for businesses, schools, property and retail. It manufactures its own signage range in polypropylene, aluminium and acrylic, and publishes software for managing a prevention programme — Safety Reports, Safety Walk and a digital intervention plan. It works from Halen in Limburg in Dutch, French and German, and also trades as IOS International.