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ISO 22324 ''Societal security --- Emergency management --- Guidelines for colour-coded alerts'' is the international standard to provide guidelines for color codes to indicate severity of hazards in public warnings. There are many different systems are already in use, such as colour state of meteorological condition or former Homeland Security Advisory System, and the standard is intended to be an approach to eliminate confusion due to such differences.〔Standards New Zealand, 2013: ''ISO Standards for timely disaster warnings will help save lives'', http://www.standards.co.nz/touchstone/consumer-safety/2013/jun/iso-standards-for-timely-disaster-warnings-will-help-save-lives/ accessed 2015-06-21.〕 The present edition ISO 22324:2015〔ISO 22324, Societal security --- Emergency management --- Guidelines for colour-coded alerts.〕 is the first ISO standard on the topic, which was developed by ISO/TC 223. == Color codes for severity level == Three basic color codes for severity levels are defined with meaning and proposed action, as in following table.〔ISO 22324:2015, Section 4.2.〕 If more than three levels of hazards are needed, the standard recommends use of colors on the spectrum between the red and green. The number of levels should be minimized to avoid confusion, not to exceed seven colors. Diversity of human limitation of ability to recognize color, including color blindness, should be paid attention when a color code system is brought into operation. The standard recommends to pay special care to provide supporting information, such as: * text (recommended color is shown in the table), numbers, shape, symbol or size * audible color name, such as audible "red alert" voice * positional cues i.e. colors should always be placed in a certain defined order in increasing levels of severity, such as left to right or bottom to top 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「ISO 22324」の詳細全文を読む スポンサード リンク
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