**2. Acoustics and related field of specializations**

When and how does humanity recognize acoustics?

The applications of the acoustics start from the historical eras for a diversity of purposes. From the prehistorical eras to the modern decades, especially with the emerging of the science and the recent innovations, the science of sound focused on informing, healing, and amusing. The main purpose of acoustics in design is the hearing of the required sounds. The diversity of disciplines, which deal with the acoustics, arises through some fields. R. Bruce Lindsay created "Lindsay's Wheel of Acoustics" (**Figure 1**) [1]. This wheel shows the fields of acoustics starting with the four broad fields of earth sciences, engineering, life sciences, and the arts. The outer circle lists the various broad disciplines one may study to prepare for a career in acoustics. The inner circle lists the fields within acoustics to which many fields naturally lead. The highlighted area shows the room acoustics, or the interior acoustical design, as well as all the related fields affecting to some extent the interior acoustical design clarified within this chapter.
