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{{Definitional Topic

|Author=Hakob Barseghyan,|Prehistory=In modern times philosophers have held a variety of views about how best to express the structure and content of scientific theories .[[CiteRef::Winther (20152016)]].

===Syntactical viewSyntactic View=== The syntactical view holds that the structure of a scientific theory can be captured by an axiomatized system of sentences. It is expressed in a metamathematical language that included predicate logic, set theory, and model theory .[[CiteRef::Winther (20152016)]]. In 1928 [[Rudolf Carnap]] published his ''The syntactical Logical Structure of the World'', which put forward this view , which was a product of central to logical empiricism, .[[CiteRef::Andersen and Rudolf Carnap, Hepburn (2015)]] [[Hans Reichenbach]], [[Otto Neurath]], [[Carl Hempel]], and [[Herbert Feigl all contributed to it]] were also major contributors. But the The logical empiricist answer to the question of the structure of scientific theories was a family of related ideas rather than a single approach .[[CiteRef::Mormann (2008)]]. The view was so widely accepted in the early twentieth century that it is sometimes referred to as the received view .[[CiteRef::Halvorson (2012)]]. ===Semantic viewView===The semantic view holds that the structure of a scientific theory can be expressed as a set of mathematical models, as models were defined by [[Alfred Tarski]]. It rejects the metamathematical language of the syntactic view .[[CiteRef::Halvorson (2012)]], [[CiteRef::Winther (20152016)]]. Some important models in science include the bag model of quark confinement, the hard ball model of a gas, the Bohr model of the atom, the Gauss chain model of a polymer, the Lorentz model of the atmosphere, and the double helix model of DNA .[[CiteRef::Frigg (2006)]]. Major proponents of the semantic view include [[John Von Neumann]], who wrote on the subject in the thirties, [[Fredrick Suppe]], and [[Bas Van Fraassen ]].[[CiteRef::Winther (20152016)]]. The semantic view emerged in the 1960’s and 1970’s and became the dominant view in subsequent decades. [[John Ladyman ]] used it in his formulation of structural realism in physics. The semantic view has played a major role in the philosophy of biology and psychology in recent decades .[[CiteRef::Halvorson (2012)]]. ===Pragmatic viewView===The pragmatic view rejects a purely formal characterization of scientific theories entirely, and supposes that a theory necessarily consists of sentences, models, problems, standards, skills, practices, including such things as analogies, metaphors, and natural kinds, with its full characterization necessarily including elements that cannot be formalized .[[CiteRef::Mormann(2008)]], [[CiteRef::Winther (20152016)]]. Proponents of the pragmatic view include [[Nancy Cartwright]], [[Ian Hacking]], Phillip [[Philip Kitcher]], and [[Helen Longino]].|History=[[Theory (Barseghyan-2015)|The original definition ]] of the term ''theory'' was proposed by Barseghyan in 2015. It defined ''a theory'' as any set of propositions that attempt to describe something.[[CiteRef::Barseghyan (2015)]] As such, this definition excluded normative propositions. It In early 2017, it was eventually replaced by [[Theory (Sebastien-2016)|the definition ]] suggested by Sebastien in 2016.|Current ViewRelated Topics=CurrentlyMethod, ''theory'' is defined as a set of propositions that attempt to describe or prescribe something. Theories can be descriptive (e.g. naturalScientific Mosaic, socialLaw, and formal science) or normative (e.g. methodology, ethics, and axiology)[[CiteRef|Page Status=Needs Editing}}{{Acceptance Record|Community=Community::Sebastien (Scientonomy|Accepted From Era=CE|Accepted From Year=2016)]]. They may be empirical or formal. They may have different levels of complexity and elaboration; they may consist of thousands of interconnected propositions or, in an extreme, of one single proposition. Examples include Einstein's theory of general relativity, the standard model in particle physics, or the neo-Darwinian theory of evolution [[CiteRef::Barseghyan (2015)|p. 3]]. Accepted From Month=JanuaryFor the purposes of the theory of scientific change (TSC), a propositional view of theories is adopted. This is because only propositions can have a truth value or be truth-like, and the acceptance and rejection of theories is a core concern of the TSC. While models may play a role in scientific practice, no part of a model may be accepted or rejected unless it can be stated propositionally. If something is not expressible propositionally, at least in principle, it cannot have a truth value, and thus cannot be accepted or unaccepted as the best view of anything [[CiteRef::Barseghyan (2015)| p. 4]].Accepted From Day=1[[File:Theory_Sebastien_2016_Definition.png|centerAccepted From Approximate=No|390px]]Still Accepted=Yes|Related TopicsAccepted Until Approximate=Method, Scientific MosaicNo