What does "percentile" mean in relation to IQ?

Adult IQ is a somewhat artificial construct. The "IQ scale" varies with the test, so that (for example) an IQ of 130 in the Wechsler tests equates to an IQ of 148 in the Cattell and Raven tests. To be meaningful, IQ score must always be quoted with details of the test and version used.

"Percentile rank" figures provide a direct comparison with others. A score at the 98th percentile means you are in the top two per cent of the population, at least on that test and on that occasion!

Since Mensa entry is based on a percentile level, the "invitation to join" sent to you after you sit our supervised tests means that you achieved the 98th percentile figure or better on one or more of the tests. Neither your actual score nor an equivalent IQ will be given.

How important is IQ?

Mensa selects people who score at or above the 98th percentile on an IQ measure. Qualifying for Mensa indicates a certain level of analytical or "convergent" thinking ability. This represents only a fraction of a person's potential -- some would say not the most important part. Having a higher or lower IQ certainly does not make you a better or worse member of society, or a more valuable or less valuable person, because IQ reflects only one dimension of the person.

A moderately high IQ may be necessary for success in some fields. But people of notable intellectual achievement usually have a capacity for original thought, which IQ tests do not assess. IQ is a rough and ready guide to one dimension of mental ability, useful within its limits. In practice so many other factors apply too -- achievement is probably still the best indicator of ability.

Isn't Mensa a rather elitist organisation?

Yes, Mensa is elitist in the sense that a football team, a university or a jazz band is elitist. Their members too are selected, at least partly, on some dimension of ability. Mensa is certainly selective.

However, to some, "elitism" may imply power or privilege in general society. Mensa is not elitist in that sense. Mensa members do not constitute an elite of power or privilege. Our international constitution explicitly states: "Mensa shall have no aim which is to the disadvantage of the community".

Is there a typical "Mensa personality"?

No, although statistically it appears Mensa members are likely to exhibit certain character traits, such as independent-mindedness, more strongly than the average person.

Selection on IQ certainly does not produce a uniform type of person among Mensa members. There is a great range and variety of personalities and interests among the members.