This master thesis details the preparation of a Design Brief for the proposed "Air & Fire" theme park. This theme park will have two different themed areas, both of which focus on technology and complement each other. The first focuses on aeronautics (Air), and the second on firefighting (Fire). A parcel of land, part of the civil airport of Innsbruck, has been selected as the future location for the building construction. The site encompasses sections of both the airport itself as well as the airport fire department, making it the ideal location for the proposed project. The concept of the theme park and its innovative combination of the two thematic fields will ensure its popularity and broad appeal, which will maximize its chances for success. As a main objective of this Design Brief is to study the park's feasibility and profitablilty, the brief is key to the effective execution of the project. The Design Brief consists of several consecutive stages. In its initial stage, a Feasibility Analysis has been carried out with the purpose of determining the physical and economic conditions of the site. Some key characteristics of the site include its geographic location, transportation connections, natural features and legal questions related to the site, competition, and potential risks. The next stage of the Design Brief, the "State of the Art," examines theme parks from an academic perspective, exploring theme parks around the world that operate in a similar vein to "Air & Fire". Three theme parks were selected for their similarity to the proposed concept, and they have been explored in detail to extract concepts and lessons that may be useful in the planning of "Air & Fire"After a thorugh review of the factors detailed above, the functional parameters of the park have been outlined. These have been formulated according to the developer's requirements, as well as the information gathered, the data analyzed, and the norms and regulations in force at the building site. In accordance with those parameters, the functional concept of the multipurpose site of "Air & Fire" has been defined. While the project-s primary function is that of exhibition, the site will also serve as an office, research, education, workshop, gastronomy and shop space. A detailed description of all of these uses, their adjacent premises and functions is included. The connections between the spaces in question, as well as the necessary common spaces, are detailed in the brief. The last section of the Design Brief analyses the park's efficiency, with the help of a simple project development calculation using the "Frontdoor-Approach." This calculation enables the determination of the period for the returns on the investment.