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10 important takeaways from this video:

00:00:06 Intelligence tests are designed in a way that you can really tell from the overall test score how good you are. The question is, if you have a 115 IQ, is that good or bad?

Classical tests are designed in such a way that the average IQ score of every person on the planet should be equal to 100.


(Image taken from here)

[EDITOR’S NOTE: Are we getting smarter as a species? James Flynn addresses the Flynn Effect this important question in this TED Talk:

00:05:18 You can measure personality, you can measure skills and competence, can you also measure motivation? Projective tests such as the Thematic Apperception Test (TAT) and the Rorschach Test attempt determine underlying themes and motivations that drive.

00:14:00 Several advantages of online testing is that:

  • Adaptively it can very quickly determine the person’s IQ by skipping from difficult > more difficult > easier questions based on the person’s performance, whereas a paper and pencil fill-in-the-blank test would most likely start easy and become harder.
  • Lower operational costs
  • Different tests and selection measures can be combined according to the position being tested for
  • Candidates can be easily compared and categorized

A major disadvantage of online testing is that you have no idea of the situation and condition in which the person is taking the test, or if the person for which the test is given is the actual person taking the test.


00:18:00 Over the course of a professional job interview, it’s not just about you convincing the company to hire you, it’s also about the company convincing you to work for them. Thus, it’s as much about questions the hiring company has about you as questions you have about the company you may work for.


00:54:10 Coorelation ® is the linear relationship between two different varieties: “Are people with more money happier than people with less money?” Whatever you measure, you almost never get a perfect correlation of r=1.0 or absolutely no correlation of r=-1,0. Coorelation will almost always fall somewhere in between.

01:00:00 Validity is whether a method really measures what it is supposed to measure. Do intelligence tests really measure intelligence? Does a personality test really measure a personality test or something else?

What we know is that success in school doesn’t only depend on intelligence (IQ). But what we really believe in a test that is supposed to measure intelligence, and the results don’t show any relation to school grades, would we believe in this IQ test? Probably not. Validity testing is how to prove it.

01:05:24 Test-Retest reliability is the ability of the test to come to the same results through numerous testing.

01:08:30 Is it possible for a test to be reliable but not valid? If I measure intelligence by measuring the size of your head, I’ll certainly find reliable results, but that doesn’t necessarily measure IQ.

01:09:40 Objectivity is the ability to disregard, or minimize, personal expectations, criteria, frames of reference and perspectives. Whenever two extreme scores are given to the same scenario, it is said that the test or decision-makers lack objectivity. If the scores are similar, then the decision-makers can be said to be objective.

01:14:14 To test objectivity, once again we refer to correlation analysis to compare the decision-makers in the test.