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The purpose of this article is to highlight concerns with the development of the MATS-1 and to validate the scale using 3,510 sex offenders from 14 unique samples. Concerns with the scale\u2019s development fall into three categories: approximations leading to considerable loss of precision, absence of appropriate statistical tests, and the use of inappropriate statistical techniques. The predictive accuracy of the MATS-1 (Area Under the Curve [AUC] = .663) was significantly lower than Static-99R (AUC = .708). The MATS-1 also significantly underestimated recidivism for some offenders. Both the relative and absolute predictive properties of the MATS-1 were not stable across samples. We conclude that the MATS-1 is not appropriate to use for applied risk assessment. Proposals are made for alternate ways to develop risk scales using the age-stratification method.<\/jats:p>","DOI":"10.1177\/1079063214529801","type":"journal-article","created":{"date-parts":[[2014,4,18]],"date-time":"2014-04-18T03:50:54Z","timestamp":1397793054000},"page":"160-186","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":13,"title":["The MATS-1 Risk Assessment Scale"],"prefix":"10.1177","volume":"28","author":[{"given":"Leslie","family":"Helmus","sequence":"first","affiliation":[{"name":"Forensic Assessment Group, Ottawa, ON, Canada"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"David","family":"Thornton","sequence":"additional","affiliation":[{"name":"Sand Ridge Secure Treatment Centre, Mauston, WI, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"179","published-online":{"date-parts":[[2014,4,16]]},"reference":[{"issue":"1","key":"e_1_3_4_3_1","first-page":"1","article-title":"Applicability of the new Static-99 experience tables in sexually violent predator risk assessments","volume":"4","author":"Abbott B. 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