SUMMARY
The instrument employed to express any value appraisal is our intellect that, by its very nature, given the invariability of objective data, cannot but express a single judgement, and never multiple judgements amongst which some are more or less probably closer to the truth, an objectively existing postulate or identified with a certain average. Thus Valuation, in its existence, remains a method of analysis, valid in all cases, independent of their nature, and requires phases of a general character. Even if the valuer, in exercising his profession, has become a profound expert in relation to the objects and situations he is called upon to appraise. With respect to the past, within the field of Valuation there now emerge new problems connected to the social changes, from a rural society to an industrial or, possibly, post-industrial one. The effect of this social modification provoked the articulation of the discipline into specialised branches: this process, to which Urban Valuation owes its genesis and its autonomy, is a result of the specialisation typical of the particularly modern sciences.