Truth: Its criteria and conditions is an in-depth critical-and-constructive inquiry in almost equal measure. The theories of the nature of empirical truth critically considered include two forms of the traditional correspondence theory; truth as appraisal; truth as identity of proposition and truth; en emotive theory of truth; P.F. Strawson's performative theory, and N. Rescher's novel theory of a coherentist criterion of truth. The constructive parts include an analysis of the concept of "a fact," the meaning and uses of 'true' and 'false' in empirical statements, together with the various sorts of conditions for their correct application; the appraisive/evaluative uses of true and false statements; and the performative-cum-cognitive uses of 'true' empirical statements; and the conditions of the performative uses of 'true.' A significant claim about the concept of truth is its indefinablity; albeit for quite different reasons from Gottlob Frege's reason based on his argument against the correspondence theory of truth.