9 ) ▁and ▁SI OP ▁( 2 0 0 3 ) ▁Princi ples . ▁The ▁most ▁recent ▁versions ▁of ▁both ▁these ▁documents ▁treat ▁valid ity ▁as ▁a ▁unit ary ▁concept ▁that ▁is ▁supported ▁by ▁a ▁variety ▁of ▁evidence . ▁However , ▁The ▁A PA ▁Stand ards ▁and ▁SI OP ▁Princi ples ▁has ▁documented ▁valid ity ▁to ▁be ▁the ▁unit ary ▁concept ▁that ▁is ▁supported ▁by ▁a ▁variety ▁of ▁evidence ▁( see ▁issue ▁ 4 ▁of ▁the ▁ 2 0 0 9 ▁volume ▁and ▁issue ▁ 3 ▁of ▁the ▁ 2 0 1 0 ▁volume ▁of ▁Indust rial ▁and ▁Organ iz ational ▁Psych ology : ▁Pers pect ives ▁on ▁Science ▁and ▁Pract ice , ▁respectively ). ▁ ▁Ass ess ing ▁individuals ▁The ▁final ▁aspect ▁of ▁Indust rial ▁& ▁Organ iz ational ▁Ass ess ment ▁is ▁assess ing ▁individuals . ▁The ▁analysis ▁includes ▁a ▁broad ▁variety ▁of ▁assess ment ▁procedures . ▁Many ▁detailed ▁tools ▁help ▁narrow ▁down ▁the ▁method ▁and ▁result ▁of ▁assess ment , ▁including ▁psych ological ▁testing , ▁bi ographical ▁information , ▁inter views , ▁work ▁sampling , ▁surve ys , ▁on board ing ▁and ▁computer - based ▁assess ment . ▁ ▁Are as ▁of ▁assess ment ▁The ▁four ▁main ▁areas ▁of ▁I / O ▁Psych ology ▁highlight — Job s , ▁Work , ▁Performance , ▁and ▁People . ▁ ▁Looking ▁at ▁each ▁category ▁gives ▁insight ▁into ▁how ▁Indust rial ▁& ▁Organ iz ational ▁Ass ess ment ▁truly ▁works , ▁and ▁what ▁is ▁necessary ▁to ▁complete ▁each ▁step ▁of ▁the ▁process . ▁These