To prove locus standi, a petitioner must demonstrate a direct and legally recognized interest in the matter by providing clear documentary evidence such as ownership records, contracts, or authorization documents that link them to the dispute. The process involves articulating the specific right affected, establishing the factual connection to the issue, and citing relevant legal provisions or precedents that validate their standing. The best lawyers ensure this by presenting precise pleadings, attaching verifiable evidence, and addressing potential objections proactively. They also conduct thorough pre-filing reviews to confirm procedural compliance and eliminate technical defects, ensuring that the case proceeds on its merits rather than being dismissed for lack of standing.