The International Journal of Engineering and Science (IJES) || Volume || 11 || Issue || 7 || Series I || Pages || PP 01-16 || 2022 || ISSN (e): 2319-1813 ISSN (p): 20-24-1805 DOI:10.9790/1813-1107010116 www.theijes.com Page 1 Smart Happy Sustainable Cities Definition and Challenges Dr / Lamiaa Adel Shaheen Faculty of Engineering – Alexandria university --------------------------------------------------------ABSTRACT-------------------------------------------------------------- Increased environmental consciousness and consideration, urbanization, and technological advancement have all resulted in a pressing need and opportunity to reconsider how cities are built and managed. During the previous few centuries, these interconnected issue developments have begun to coalesce under the new umbrella of Smart Sustainable Cities. The purpose of this chapter is to initiate and debate the concept of Smart Happy Sustainable Cities and smart material.The paper will also propose a definition of Smart Happy Sustainable Cities and discuss some of the key challenges associated with putting the concept into practice. While there are numerous definitions for smart cities and sustainable cities, the Combination of the two has received less attention. Furthermore, given the variety of definitions of smart cities and sustainable cities, creating such a combination is a difficult task. Nonetheless, a definition of Smart Happy Sustainable Cities is required to provide a shared understanding of the concept and to serve as a foundation for future discussions on what Smart Happy Sustainable Cities aspire to deliver.(Researcher, 2022 ) Keywords: Happy City, Computer aided architectural design (CAAD), Architectural representation, Computational design, Happiness in Communities ------------------------------------------------------------------------------------------------------------------------------------ Date of Submission: 05-07-2022 Date of Acceptance: 31-07-2022 ------------------------------------------------------------------------------------------------------------------------------------ I. Developing a Definition for Smart Sustainable Cities A concept of Smart Sustainable Cities can be defined in two ways. The first is a deductive reasoning, where the concept is created by examining and formulating how the term was defined by others in hypothesis and/or rehearse.This practices can result in a single definition or a characteristics of definitions, based on how consistent the recognised classifications are.The second method follows a positivist paradigm, in which the definition-creation process begins with a theory or proscriptive declaration about what Smart Sustainable Cities ought to be, and then a definition is explained on that basis.In practice, these "ideal sorts" of approaches are merged, either subconsciously, with one of them dominating. (World Commission on Environment and Development Oxford (1987)) . I-1 -Sustainable Cities that are both smart and sustainable are referred to as smart sustainable cities. One important reason for this is that the term "sustainable" is understood to be a behavioural and shaped by social concept. Sustainable Smart Cities: The concept of definition and challenges is used to highlight a desired state or development path. This means that an inductive approach to defining sustainable development cannot be used (or sustainable or sustainability). From the top down, the concept must be defined. We depart from the Brundtland report's 1987 definition of sustainability for the purposes of this chapter. We'd like to emphasize that we abide to the entire concept, such as explanation of requirements and develop members , because this definition has been both misinterpreted and misused: Sustainable development is defined as "development that fulfils current requirements without jeopardizing future generations' capacity to achieve their own." It includes 2 main concepts: • the hypothesis of 'necessities,' or the vast amount of resources available to the poor and needy that must be prioritized. • the concept of technical and digital constraints on the environment's capacity to cope with the changing." (World Commission on Environment and Development Oxford (1987)) . Brundtland's definition of sustainable growth encompasses the entire globe. An addendum is required when applied to anything less than the entire world. The Swedish government has responded by establishing a "the familial aim," whereby "the overarching objective of Swedish environmental legislation is to give the next generation a society wherein the significant environmental difficulties in Sweden have been fixed, without