Research is used to test the validity of instruments.
Jonas Cabungcal Cortes -LRB- born July 20 , 1966 -RRB- is the current congressional representative of the sixth district of Cebu .. Cebu. Cebu. and was former Mayor of Mandaue City in 2007-2016 , who was Mandaue City Councilor .. Mayor of Mandaue City. Mayor of Mandaue City. Mandaue. Mandaue. Mandaue City. Mandaue City