Because of the complex nature of land records, and the absence of precise boundaries on most title deeds, a chartered surveyor is often required to help solve disputes. The surveyor will pursue several lines of enquiry, including investigating historical documents, physical features of the land and all the available legal documents. They will then be able to compile technical evidence to prove who owns the land. Usually this will solve the dispute, but if both parties still disagree the surveyor will act as an expert witness in court, which means they will provide the technical evidence and advice required for the court to make a decision.