In the article the criteria of evaluation of methodological theories are formulated. Methodology of Laudan and Lakatos are examined in more detailed way.
The paper is divided in several parts, entitled as follows: introduction; the standard view, its characteristic; constructive challenge of the received standpoint; attempted resolutions of the prob- lem of comparability; how do work visual perceptions in scientific observations? meaning variance of scientific terms; an attempt to construe the ground for comparability — concluding remarks.