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AAT ICAS 2034 ✧ overview of metrication approaches and strategies

document note: this document is part of the Integrated Chronological Applications System (ICAS). Alliance for the Advancement of Technology (AAT) provides ICAS standards documents subject to terms of use described in document AAT ICAS 9010. please refer to other key AAT ICAS standards documents accessible via the AAT ICAS web site at for important information about ICAS.


AAT ICAS metrication approaches and strategies

this document describes an overview of some methods or strategies for planning a metrication program or preparing for metrication-readiness. content of this document is not intended necessarily to represent conformance with ICAS or other standards, nor to provide advice about the costs or benefits involved in implementing a metrication program. this document is subject to further specification.


identify designated uses

various scales of date and time are used throughout society. people are familiar with the use of a 24-60-60 clock, and with the use of traditional month and weekday schemes. however people are also familiar with the decimal system of numbers, and with a system of alphabetical order. organizations with a need for the normative expression of dates and times, or with a need for scheduling across various local times, may have more incentives for the development of more practicable methods and applications for the use of time and date scales. yet individual users may also find that the use of uniform scales of date and time can accommodate performance improvements from an increased precision and calculability that is accommodated by a decimalized scale of time.

developers and users should consider the advantages and costs involved in metrication efforts. to the present an enormous collective investment has been made in the use of traditional scales of timekeeping and calendaring. however a large and significant collective market for the use of timekeeping and calendaring applications and methods has not yet been created. some users may find that practicable methods of ICAS metrication can be administered in terms of normal operating costs and not necessarily as special additional costs. indeed potential scenarios of use may more than justify such a determination for certain organizations.

however in the context of the predominant use of pre-existing traditional scales of time and date, outlines for metrication may be viewed as unnecessary or unfeasible. those who are undecided about metrication may need to determine that the effort and cost of metrication is economical or worthwhile. although the comparative practicability of uniform scales may be a prominent factor in the views of some users, for others matters of tradition or convention are more determining. there may also be questions or concerns about metrication that should be resolved. consider the enlistment of opinion leaders who can help with a transition.

learn more about the history of information sciences and arts, which include calendaring and timekeeping, from a variety of sources.


identify methods and applications

consider whether and how a practice, method, or application may be sensitive to the use of traditional scales. consider any methods and practicability of support for the use of multiple scales. consider that metrication is not a method or application, but a process that might involve many systems.

local time is traditionally reckoned in terms of the time designated for a locale. local time is thus generally referenced in terms of a local time zone. reference of local time with regard to Universal Time tends to be common only for users in the course of certain specialized purposes. astronomers use a system of Julian Dating and a decimalized representation of Universal Time for expressing astronomical observations. however globalization trends such as the Internet, telecommunications, and transportation also introduce references to local time in relation to a UT standard into everyday use. similarly, ICAS methods and applications can be developed for designated practicable purposes.


determine schedule and strategies for support

determine the strategies and resources for a metrication plan. Metrication can be done one step at a time. consider scheduling an M-day for different areas of use such as for the metrication of documents or signs, or for the metrication of scales for mass. Schedule time before the M-day for the process of making the transition. Or consider scheduling an I-day for the process of preparing to use interchange-ready formats for dates and times.


review and improve

determine an appropriate quality management system for designated methods and applications. AAT usability evaluations have shown that ICAS methods may be particularly practicable for purposes related to quality management.

AAT hasn't determined how much training an individual should have to be considered ICAS proficient. with reference to a voluntary standard of 'ICAS in use', there are certain precedents for leaving many of these matters for users and user-organizations to decide.

however there are some clear benchmarks that it is easier to teach and to learn metric principles for a wider range of general use than it is to teach and to maintain pre-metric principles. moreover comparisons are generally more practicable among metric units than among pre-metric units.


list of methods for metrication

top document updated:

system identifiersdatetime
Uniform CalendarUCUCN 12019 S19 Yellow
Inter-Dial ClockIDCzone(UT)t339 tt050
'ICAS in use' can accommodate calendar and clock formatting 'for all people, for all time'.
day of yearD-o-YAD common year day139
Gregorian calendarGG2019 May 19 Sunday
seconds, minutes, hoursSMHUT08:08:14
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