?summon any assessor, deputy, or other person to appear before it to be examined under oath concerning the method by which any evaluation has been ascertained.??? 35 ILCS 200/16-10.If, after the BOR has rendered its decision, the property owner remains dissatisfied, he may appeal the decision to the Illinois Property Tax Appeal Board (???PTAB???). 35 ILCS 200/16-160.