Abstract: A computer-implemented method for constructing and manipulating a Graphic User Interface (GUI), comprising retrieving from a data repository first GUI data representing at least (i) an entity, (ii) attributes of an entity, (iii) a manipulatable scale associated with a respective attribute; constructing on a screen the GUI including converting the first GUI data into displayable GUI data which include at least the entity, its attributes and for at least one of the attributes a manipulatable scale and displaying the displayable GUI data; enabling a user to perform on the GUI a manipulation of at least one manipulatable scale of a respective attribute giving rise to manipulated displayable GUI data; converting the manipulated displayable GUI data into second GUI data representing at least one data record; and using the at least one data record or portion thereof for operations in the data repository.