"You give me the right people and I don't care what organization you give me. Good things will happen. Give me the wrong people, and it doesn't matter what you do with the organization. Bad things will happen."
Colin Powell

Putting round pegs in round holes is the key to effective selection.
Utilising tools to help assess applicants and their suitability for specific positions, in conjunction with other rigorous selection processes, helps organisations to ensure they really are hiring the right person for the job.