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In most cases, increasing the number of items on a personality test will increase the reliability of measurement (see the Spearman-Brown formula). Thus, there is a trade-off between test length and reliability. There are several 10 item measures of the Big 5. Notably, the TIPI and BFI-10 (Rammstedt et al, 2007). However, I would strongly discourage anyone ...


Your definition of intelligence ("...the ability to learn and research on any subject...") is exactly what IQ tests measures; general abstraction and reasoning ability. A nice article about the validity of IQ and the flimsy scientific basis of multiple intelligences. That is surely the best way to measure intelligence. However, IQ tests aren't completely ...

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