A reflection on the origin and formation of "interior decoration", "interior design", and "interior architecture"

"Interior decoration", "interior design", and "interior architecture" are known as three names that refer to specialties that are focused on the organization of interior spaces. The emergence of these three specialties takes place in a historical process; first "interior decoration" in the early nineteenth century, then "interior design" in the early twentieth century, and then "interior architecture" about four decades ago. The precedence and delay in the emergence and application of these specialties does not mean the complete replacement of the latter over the earlier one; however, in some cases and for some reasons, the former specialty has been replaced by the latter. In fact, these three specialties, despite their many similarities and commonalities, have different meanings and uses and in relation to each other, and they have created a relationship that is questionable and worth considering. So the main question of this research is what is the relationship between the mergence of "Interior decoration", "interior design", and "interior architecture".To answer the above question, first, the foundations and origins of each are examined and analyzed. This is because by finding the roots and recognizing the factors and conditions of each period, it is possible to identify the requirements and needs that have affected the emergence of each. These factors and conditions form a system in which they interact and are affected. As a result, their interaction leads to the formation and objectification of each of these specialties. After recognizing the way the three specialties are formed, their function and functional evolution have been studied in both the context of profession and education. In this way, the relationship between these three specialties is explained. Since the subject of this research is to know the origin of these professional areas and how it is formed, the main focus is on beginning to find the subject matter of these specialties that have lasted from the early nineteenth century to the late twentieth century. In the last two decades, these specialties have become more widespread in the profession and education, and so a careful study of this issue requires further opportunities. Therefore, the time period studied in this research is from around 1800 to 2000.So the goal of this study is to understand the relationship between these three titles. The methodology of this research is analytical, interpretive, and logical reasoning. This means that by searching, collecting, and organizing documents, and evaluating and interpreting data, a description of the origin and formation of these three specialties is provided. The findings of this study show how the factors influencing the formation and survival of "interior decoration", "interior design", and "interior architecture" operate and how they relate to each other. Since a relatively short time has passed since the introduction of these specialties, this research can help to understand each of these three areas of expertise more accurately and is effective in clarifying their position in relation to each other. Continuation of this research can help to develop the concepts and theoretical foundations of these specialties.