Whether to admit an applicant to a course is entirely the decision of each individual university. They will base their decision on a variety of factors, but primarily the grades predicted or already received in school leaver examinations. As more and more applicants are attaining higher and higher grades in the A level examinations, most universities also use secondary admissions criteria. These may include results at GCSE or Standard grade examinations (or equivalent), the references provided on the application and the information provided on the personal statement. The personal statement can often be the deciding factor between two similar candidates so a small industry has sprung up offering false personal statements for a fee. UCAS uses "similarity detection" software to detect personal statements that have been written by third parties or copied from other sources, and universities can reject applications for this reason.