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Approximately half of college students report experiencing a blackout in their lifetime. Blackouts are associated with an increased risk for negative consequences, including serious injury. Research has documented two types of blackouts, en bloc (EB) and fragmentary (FB). However, research is limited by the lack of a validated measure that differentiates between these two forms of blackout. This study used a mixed\u2010methods approach to improve the assessment of FB and EB among young adults. Specifically, we sought to improve the existing Alcohol\u2010Induced Blackout Measure (ABOM), which was derived from a relatively small pool of items that did not distinguish FB from EB.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>Study 1 used three rounds of cognitive interviewing with U.S. college students (<jats:italic>N<\/jats:italic>\u00a0=\u200931) to refine existing assessment items. Nineteen refined blackout items were retained for Study 2. Study 2 used face validity, factor analysis, item response theory, and external validation analyses to test the two\u2010factor blackout model among U.S. heavy\u2010drinking college students (<jats:italic>N<\/jats:italic>\u00a0=\u2009474) and to develop and validate a new blackout measure (ABOM\u20102).<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Iterative factor analyses demonstrated that the items were well represented by correlated EB and FB factors, consistent with our hypothesis. External validation analyses demonstrated convergent and discriminant validity. These analyses also provided preliminary evidence for the two factors having differential predictive validity (e.g., FB correlated with enhancement drinking motives, while EB correlated with coping and conformity motives).<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>The Alcohol\u2010Induced Blackout Measure\u20102 (ABOM\u20102) improves the measurement of blackout experiences among college students. Its use could facilitate the examination of EB and FB as differential predictors of alcohol\u2010related outcomes in future studies.<\/jats:p><\/jats:sec>","DOI":"10.1111\/acer.14882","type":"journal-article","created":{"date-parts":[[2022,6,15]],"date-time":"2022-06-15T07:30:41Z","timestamp":1655278241000},"page":"1497-1514","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":14,"title":["A mixed\u2010methods approach to improve the measurement of alcohol\u2010induced blackouts: <scp>ABOM<\/scp>\u20102"],"prefix":"10.1111","volume":"46","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-8734-193X","authenticated-orcid":false,"given":"Cassandra L.","family":"Boness","sequence":"first","affiliation":[{"name":"Center on Alcohol, Substance Use, and Addictions University of New Mexico  Albuquerque New Mexico USA"},{"name":"Department of Psychological Science University of Missouri  Columbia Missouri USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Natalie","family":"Gatten","sequence":"additional","affiliation":[{"name":"Department of Psychological Science University of Missouri  Columbia Missouri USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mc Kenna","family":"Treece","sequence":"additional","affiliation":[{"name":"Department of Psychological Science University of Missouri  Columbia Missouri USA"},{"name":"Department of Counseling and Counseling Psychology University of Missouri Kansas City  Kansas City Missouri USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0624-1414","authenticated-orcid":false,"given":"Mary Beth","family":"Miller","sequence":"additional","affiliation":[{"name":"Department of Psychological Science University of Missouri  Columbia Missouri USA"},{"name":"Department of Psychiatry University of Missouri  Columbia Missouri USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2022,6,30]]},"reference":[{"key":"e_1_2_9_2_1","doi-asserted-by":"publisher","DOI":"10.1037\/adb0000796"},{"key":"e_1_2_9_3_1","doi-asserted-by":"publisher","DOI":"10.1111\/acer.14019"},{"key":"e_1_2_9_4_1","first-page":"1","volume-title":"The Alcohol Use Disorders Identification Test","author":"Babor T.F.","year":"2001"},{"key":"e_1_2_9_5_1","doi-asserted-by":"publisher","DOI":"10.15288\/jsad.2014.75.103"},{"key":"e_1_2_9_6_1","doi-asserted-by":"publisher","DOI":"10.1037\/0033-2909.110.2.305"},{"key":"e_1_2_9_7_1","doi-asserted-by":"publisher","DOI":"10.1111\/acer.13121"},{"key":"e_1_2_9_8_1","doi-asserted-by":"publisher","DOI":"10.15288\/jsad.2020.81.401"},{"key":"e_1_2_9_9_1","doi-asserted-by":"publisher","DOI":"10.1037\/bul0000333"},{"key":"e_1_2_9_10_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.genhosppsych.2021.01.002"},{"key":"e_1_2_9_11_1","doi-asserted-by":"publisher","DOI":"10.15288\/jsa.1997.58.100"},{"key":"e_1_2_9_12_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.drugalcdep.2005.03.023"},{"key":"e_1_2_9_13_1","doi-asserted-by":"publisher","DOI":"10.1037\/1040-3590.6.2.117"},{"key":"e_1_2_9_14_1","doi-asserted-by":"publisher","DOI":"10.1037\/h0040957"},{"key":"e_1_2_9_15_1","doi-asserted-by":"publisher","DOI":"10.1037\/adb0000190"},{"key":"e_1_2_9_16_1","doi-asserted-by":"publisher","DOI":"10.3109\/10826089109062153"},{"key":"e_1_2_9_17_1","doi-asserted-by":"publisher","DOI":"10.1192\/bjp.115.526.1033"},{"key":"e_1_2_9_18_1","doi-asserted-by":"publisher","DOI":"10.1023\/B:JOBA.0000007455.08539.94"},{"key":"e_1_2_9_19_1","doi-asserted-by":"publisher","DOI":"10.1037\/met0000465"},{"key":"e_1_2_9_20_1","doi-asserted-by":"publisher","DOI":"10.15288\/jsa.2003.64.547"},{"key":"e_1_2_9_21_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1530-0277.2003.tb04399.x"},{"key":"e_1_2_9_22_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.cortex.2012.05.021"},{"key":"e_1_2_9_23_1","doi-asserted-by":"publisher","DOI":"10.1111\/acer.13010"},{"key":"e_1_2_9_24_1","doi-asserted-by":"publisher","DOI":"10.1007\/BF02289447"},{"key":"e_1_2_9_25_1","doi-asserted-by":"publisher","DOI":"10.1080\/10705519909540118"},{"key":"e_1_2_9_26_1","doi-asserted-by":"publisher","DOI":"10.1080\/07448481.1992.10392818"},{"issue":"1","key":"e_1_2_9_27_1","first-page":"1","article-title":"Phases in the drinking history of alcoholics. 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