ICS Forms Numbers: Why are ICS forms numbered 200-something? As ICS was being established the contractors working with the FIRESCOPE technical team developed a filing system to keep track of ICS notes, documents, and guides.

• Development documents and notes were filed away in 100 series,
• The 200 series was established for common forms,
• The 300 series for training documents, and
• The 400 series for ICS guides.