urposeThisresearchinvestigatestheeffectofdisclosure–qualitywithtwomaincomponents,reliabilityandtimeliness,oneconomicvalueaddedinIran. cludes170TehranStockExchangelistedcompaniesfrom2008-12.Multipleregressionanalysiswasappliedtotestthehy-pothesesandestimatesofthecoefficients.Firmsizeandreturnonassetswerethecontrolvariables. ResultsTheresultsshowthattimelinessofinformationhas–apositiveimpactoneconomicvalueadded.Wedidnotfindanysignificantrelationshipbetweendisclosurequalityandreli-abilityofinformationandeconomicvalueadded.Theregressedmodelshowsthatthereisnosignificantassociationbetweenfirmsizeandeconomicvalueadded.Theresultsalsoshowthatthereisapositiveassociationbetweenreturnonassetsandeconomicvalueadded. Conclusions–Theoretically,timelyinformationiseffectiveindecision-making.Thisstudyshowsthattimelinessofinformationhaspositiveeffectonthecreationofeconomicvalueadded.However,disclosurequality,reliability,andfirmsizedonotef-fectoneconomicvalueadded.Companieswithgreaterreturnonassetsproducegreatereconomicvalueadded.