With such a broad denotation, there is no universal language or unifying institution for designers of all disciplines. This allows for many differing philosophies and approaches toward the subject (see Philosophies and studies of design, below). The person designing is called a designer, which is also a term used for people who work professionally in one of the various design areas, usually also specifying which area is being dealt with (such as a fashion designer, concept designer or web designer). A designer's sequence of activities is called a design process. The scientific study of design is called design science.Additional definitions, Design is planning to manufacture an object, system, component or structure. Then, the word "design" can be used as a noun or a verb. In a broader sense, the design is an applied art and engineering that integrate with technology. With a design definition is fairly broad, the design has a myriad of specifications that professionals in their fields, and yet there is one institution that can collect all of the manifesto of the design as a whole, although it does not mean we do not find the schools that initiated the birth of designers.Substantial disagreement exists concerning how designers in many fields, whether amateur or professional, alone or in teams, produce designs. Dorst and Dijkhuis argued that "there are many ways of describing design processes" and discussed "two basic and fundamentally different ways", both of which have several names. The prevailing view has been called "The Rational Model", "Technical Problem Solving" and "The Reason-Centric Perspective". The alternative view has been called "Reflection-in-Action", "Evolutionary Design", "co-evolution", and "The Action-Centric Perspective".