To do business with companies, ESA has developed a procedure and an associated ESA Costing Software tool called ECOS for aggregating and calculating the price elements of the financial proposals through the entire contractual chain.

This web page contains all relevant information about ECOS, including detailed explanations about the tool, a self-training manual as well as access to the ECOS helpdesk: https://www.esa.int/About_Us/Business_with_ESA/How_to_do/Introduction_to_ESA_Costing_Software