The anxiety disorders and humor are very frequent dysfunctions emotional impact on the quality of human life. Psicométricos quantify these tests and clinical disorders guide ducts. The application of tools and concepts of metrology can contribute to ensuring reliability of psicométricos measurement instruments. Job objectives are the development of a proposal for harmonization between terms used in psicometria and universal definitions for measuring terminology in accordance with the international vocabulary of basic and general terms in Metrology (VIM); and the assessment of the reliability of Beck inventories metrology and Hamilton to quantification of anxiety and mood disorder. Were made: (I) studies bibliographical terms of metrology and psicometria for the establishment of the proposed harmonization; (ii) implementation of inventories of Beck (BAI and BDI) and Hamilton (ham and HAM-d) 100 patients (iii) assessment of validity, quantification of convergence and disorders of the measurement uncertainty calculation between inventories of Beck and Hamilton; (iv) development and implementation of the analysis of selecting parameters of items (ASPI) approach to identification of the capacity of each item of an inventory to discern between different levels of acometimento of construction. All inventories quantify equivalent only serious patients. BAI and BDI submitted the largest percentage of items capable of discernment among acometimento levels. Good match obtained between the approaches quantitative and qualitative ASPI ASPI characterised the predictive capacity of quantitative indicators proposed in item performance identification.