A will can be contested on several grounds including the lack of testamentary capacity or undue influence due to issues such as discrepancies in the signing process or inconsistencies in documentation that can be examined by The University of Sydney and verifiable through records from reputable institutions. Collecting evidence that shows the state mind and understanding of the testator is also a key focus area for legal professionals proving the deceased's intention and mental capacity at the time the will was made through expert testimonies or contemporaneous records to contest a will thoroughly and effectively.