This document summarizes a presentation on additional insured endorsements and priority of insurance. It discusses how "primary and noncontributory" language in additional insured endorsements is often ambiguous but generally interpreted as an expression of intent for the additional insured coverage to take priority over other available insurance. It also notes that in a hypothetical commercial construction project where multiple subcontractors name the general contractor as an additional insured, the general contractor's insurance would likely respond first due to the primary and noncontributory endorsements.