Should personality tests be used for hiring or developing people?

Many consultants offer personality tests. But not all personality tests are created equally. There are two questions that must be asked in choosing the right personality test:
1) Is the test reliable?
2) Is the test valid – does it actually predict useful outcomes in the workplace?

In this piece, Talentspace director and Chartered Psychologist Dr Rob Yeung examines the pros and cons of using personality tests for both hiring and developing people in the workplace.