Common
De facto standard
Convention that is widely accepted but unofficial
De facto standard
A de facto standard is a custom or convention that is commonly used even though its use is not required. De facto is a Latin phrase (literally "of fact"), here meaning "in practice but not necessarily ordained by law" or "in practice or actuality, but not officially established". A de facto standard contrasts an international standard which is defined by an organization such as International Standards Organization, or a standard required by law (also known as de jure standards). Joint technical committee on information technology (ISO/IEC JTC1) developed a procedure in order for de facto standards to be processed through the formal standardization system to be transformed into international standards from ISO and IEC. In social sciences a voluntary standard that is also a de facto standard is a typical solution to a coordination problem. The choice of a de facto standard tends to be stable in situations in which all parties can realize mutual gains, but only by making mutually consistent...
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