The first step when building a best-in-class secure ICS should be to collect all existing information about assets, including:
• Manufacturing cells and material flow diagrams;
• Location plans for equipment and manufacturing cells;
• Information systems and ICS supporting the operation;
• Dependencies between information systems, industrial control systems, and manufacturing cells;
• General information about information systems and ICS, including vendor names, versions of firmware, hardware and application software, list of, and other data;