The previous knowledge consider architectural form as a text like language texts, which sending messages holds meanings through codes that reflects a set of shapes and relations to the receiver. So that the architecture consider as a communicating and expressing language (Visual Text). Therefor it need to analyze corresponding characteristics which represent common bases combine the styles. In addition, deriving the differences that classify and characterize the architecture according to a certain type or style, or with a specific designer. This research assume that clarifying similarities and the differences in shape could be by (Genetic Tape) ,which is give person as well as architecture their identity . This enhanced by the technological development which offers the possibility of recognizing any product through its barcode, that holds all the information of the product and how to invest this in architecture. The range of building that require applying this mechanism are extensive, but the most needed building that requires an extra focusing is the ones that carries value of cultural heritage ,
All above showing the need for specialized scientific study to illustrate the possibility of finding genetic tapes for building’s characteristics that helps to classify and explain the variation. The research problem as stipulated (the role of encoding process in determining the genetic tape for historical building). Thus the goal of this study is identified as (determining the characteristics of historic buildings and categorized it using genetic tapes). Furthermore, to solve the research problem it needed a method consist of three stages, first establish a comprehensive conceptual framework regards the genetic tape outside the field of architecture and the potential possibilities of employing it in architecture, in addition to clarifying the encoding process , second stage illustrate the conducting study and the selected sample ( the selected samples were eight Islamic palaces , four of them belong to the Umayyad era , and the others to the Abbasid period ), then identifying the style and method of measurement and analyzing , finally analyzing the selected samples , showing the results , conclusions and recommendations .