How do you decide if a good psychometric instrument is actually good? Its creators will tell you how many validity and reliability tests have been done for the test. When it comes to taking these instruments, one oft-heard remark is "can it really tell me something about myself?" It is a valid question and deals with validity and reliability of the instrument. On the other hand, most self-respecting and honest psychometricians will also tell you this - "nobody can claim to know you better than what you know about yourself."
Which means that if I lie through my test, I would already know this fact when looking at the results. If I can thus delude myself, what is the next best way of telling me that I am a liar? Ask others! But then, it won't be that easy, will it? If there could be a way of taking a psychometric instrument all by oneself, but generate data about 'how others would describe me' then that would be wonderful. Like having a cake and eating it too.
Which means that if I lie through my test, I would already know this fact when looking at the results. If I can thus delude myself, what is the next best way of telling me that I am a liar? Ask others! But then, it won't be that easy, will it? If there could be a way of taking a psychometric instrument all by oneself, but generate data about 'how others would describe me' then that would be wonderful. Like having a cake and eating it too.