Insurance policies are simply contracts and, when disputes arise, their wording is often relied upon to support arguments for or against coverage. This is a major reason why clear wording is very important. Court cases are a significant source that triggers changes in policy language. They may occur either through the impact of actual cases or indirectly through changes in the law that have their origins in addressing wider spread situations on how insurance responds to certain types of losses. Examples involve confusion over water-related losses, concurrent causes of loss and confusion over how the word "insured" is interpreted.
With regard to more parties being granted insured status, insurers recognize that coverage obligations should be extended under certain circumstances. However, carriers want to have sufficient knowledge of parties that they may be obligated to reimburse or defend against claims.
Click here for an excerpt of wording on "Who Is An Insured" found in the ISO Commercial General Liability's coverage analysis in PF&M.