RESUMEN
Defining the classical Chinese diagnosis such as by the Heidelberg model of TCM has shown that outcome of studies is largely dependent on classical diagnostic criteria.The quality of future studies in TCM will largely depend on a variety of factors,such as(1)the classical Chinese diagnosis as an inclusion criterion,(2) objectively measurable parameters as the main criterion of outcome,(3)double blinding of controls.A common understanding of the diagnosis and functional criteria of TCM is therefore necessary,as well as a common understanding of the functional terminology and rationally accessible theory. This undedines the necessity of classical Chinese medical theory for modern scientific research,its proper definition and application in studies.