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To be announced (TBA), to be confirmed (TBC), and to be determined (or to be decided) (TBD) are placeholder terms used very broadly in event planning to indicate that although something is scheduled or expected to happen, a particular aspect of that remains to be arranged or confirmed. ==TBA vs. TBC vs. TBD== These phrases are similar, but may be used for different degrees of indeterminacy: *To be determined (TBD) - the appropriateness, feasibility, location, etc. of a given event has not been decided. *To be announced (TBA) - details may have been determined, but are not yet ready to be announced. *To be confirmed (TBC) - details may have been determined and possibly announced, but are still subject to change. Other similar phrases sometimes used to convey the same meaning, and using the same abbreviations, include "to be ascertained", "to be arranged", "to be advised", "to be adjudicated", "to be done", "to be decided", and "to be declared". Use of the abbreviation "TBA" is formally reported in a reference work at least as early as 1955,〔Robert J. Schwartz, ''The Complete Dictionary of Abbreviations'' (1955).〕 and "TBD" is similarly reported as early as 1967.〔Ralph De Sola, ''Abbreviations Dictionary'' (1967).〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「To be announced」の詳細全文を読む スポンサード リンク
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