A 2011 meta-analysis classified EI studies into three streams: "(1) ability‐based models that use objective test items; (2) self‐report or peer‐report measures based on the four‐branch model of EI; and (3) “mixed models” of emotional competencies." It found that these "three streams have corrected correlations ranging from 0.24 to 0.30 with job performance. The three streams correlated differently with cognitive ability and with neuroticism, extraversion, openness, agreeableness, and conscientiousness. Streams 2 and 3 have the largest incremental validity beyond cognitive ability and the Five Factor Model (FFM)." The meta-analysis concluded that "all three streams of EI exhibited substantial relative importance in the presence of FFM and intelligence when predicting job performance." A follow-up meta-analysis in 2015 further substantiated these findings, and addressed concerns about "the questionable construct validity of mixed EI measures" by arguing that "mixed EI instruments assess a combination of ability EI and self-perceptions, in addition to personality and cognitive ability."