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International Civil Aviation Organization (ICAO)
Common Taxonomy Team (CICTT)
Adopting CICTT Taxonomies and Standards
January 2006
The CICTT
The International Civil Aviation Organisation (ICAO) and the Commercial Aviation Safety Team
(CAST), which includes Government officials and aviation industry leaders, have jointly
chartered the CAST/ICAO Common Taxonomy Team (CICTT). CICTT includes experts from
several air carriers, aircraft manufacturers, engine manufacturers, pilot associations, regulatory
authorities, transportation safety boards, ICAO, and members from Canada, the European
Union, France, Italy, Japan, the Netherlands, the United Kingdom, and the United States.
CICTT is co-chaired by a representative from ICAO and CAST.
The Problem
The establishment of the CICTT follows from recognition that wide variations in aviation
nomenclature not only results in confusion as to meaning, but also seriously devalues safety
data and information by creating unintended and unnecessary constraints on the aviation
industry’s ability to analyze data, integrate data from multiple source systems and share data.
Variations in aviation nomenclature also result in data quality problems such as duplicate or
multiple entries for the same event or entity. While some of these variations in nomenclature
result from data entry errors, a contributing factor of perhaps equal importance is the absence of
rigorous industry-wide standardized business rules or naming conventions for descriptors and
definitions. In the absence of such rules or conventions, even the most rigorously applied
definitions contain anomalies and exceptions that constrain use of the data for safety analysis
and sharing purposes.
The Goal
What the CICTT is attempting to accomplish is the development of an industry-wide consensus
as to what business rules and naming conventions should be applied for key aviation
descriptors and data elements. The long-term goal of this effort is the development of a core
universal aviation language that will maximize the industry’s capability to analyze and share
aviation safety data and information.
Adoption of CICTT Products
There is no intent to impose the rules and conventions on any entity: i.e., mandatory reengineering
of existing information systems is not being proposed. Rather, the expectation is
that aviation entities would recognize the benefits that would follow from adoption of a standard
set of rules and conventions, and over time would voluntarily adhere to them whenever they
performed major up-grades to existing information systems or acquired new systems.
Therefore, while there is no intent to mandate immediate use of the standards, the long-term
goal is to accomplish that outcome as a result of the entire industry having adopted the
standards on an evolutionary and voluntary basis.
To accomplish its objectives, CICTT has initiated the development of common taxonomies and
definitions in the following categories: Phase of Flight; Occurrence Categories; Aircraft
Make/Model/Series; and Engine Make/Model/Sub Model. Additional taxonomies and definitions
will be developed once the initial set is completed. The purpose of this document is to provide
guidance on how an organization can adopt CICTT taxonomies and definitions.
2
Overview of the Taxonomies
A group that included both aviation operations domain experts as well as users of aviation
safety data and information developed the taxonomies. The taxonomies represent a consensus
recommendation for a schema that can be used on a universal basis to classify aviation safety
incidents and phase of flight.
Two key benefits associated with applying the taxonomies are: (1) they minimize ambiguity
when describing like or similar aviation events, (2) they allow adopting organizations to
inexpensively share data and information for the purpose conducting safety analysis.
Adopting Taxonomies to Current Systems
When an organization initially adopts a CICTT taxonomy, the CICTT recommends that the
organization follow the steps below (the Occurrence Categories is used as an example):
Step Example: Adopting Occurrence Categories
1. Identify the current system to which the
CICTT taxonomy applies
Identify the accident/incident reporting system
2. Analyze the current system to identify
where the CICTT applies in the system
Identify the table in the accident/incident
reporting system that records the type of
accident/incident
3. Add new data elements that record new
taxonomy information
Add data element(s) that record the CICTT
Occurrence Category
4. Update documentation to the reflect the
modification to the current taxonomy
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