Hi all,
I just want to make a few comments:
Ability tests ARE psychometric tests just as Personality tests are psychometric tests.
I would recommend that you meet with a qualfied Level A and B workplace assessor, or an organizational psychologist or senior HR person who has in depth experience in using testing.
Personality tests like the 16 PF, 15 FQ etc can give some insight into the manner in which a candidate is likley to respond in a situtation.
Ability tests, can measure verbal, numerical and abstracti reasoning.
Various other aptitude tests may give you info about other skills sets.
It seems to me that first step is to identify what attributes in your recruits are you trying to measure? Have your defined the competencies you think are important to the role in behavior terms so that behavior and be observed and evaluated against a testing tool.
NO test should be used as the sole criterion for hiring or not hiring someone. That would be an unethical approach to testing.
I hope that helps.
Regards,
Bruncha