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I would add:
Category 5: Source of Data Differences
1. The consumer expects the data to be from one source (or set of
sources), but it results from a different source (or set of sources).
Example: The consumer asks for data from all counties in a given
U.S. state, but the data is instead from all towns within a single
county. Or, the consumer asks for data from a specific federal agency
but they receive data for another federal agency.
Hopefully these occurrences are rare if not inexistent.
Booz | Allen | Hamilton
"Roger L. Costello" wrote:
> Hi Folks,
> Terminology: a "producer" creates and outputs data; a "consumer" inputs
> and processes data.
> Objective: Below I try to categorize all the *potential* mismatches
> between a producer and a consumer, with respect to data.
> Question: Are there other categories that I am missing? Do you agree
> with my categories?
> Category 1: Interpretation Differences
> 1. Structure mismatch: the producer creates the data with a
> certain structure and the consumer expects it in a different
> Example: The producer specifies a date as mm-dd-yy but
> the consumer interprets it as mm-dd-yy.
> 2. Units mismatch: the producer and consumer use different units.
> Example: the producer gave the data in inches but the consumer
> interprets the data in centimeters.
> 3. Meaning mismatch: the consumer interprets the data in a different
> way than the producer intended.
> Example: the consumer interprets an aircraft "departure time" to
> mean the time the doors shut, while the producer meant it as the
> the time the wheels touch off.
> 4. Reference system mismatch: the producer and consumer interprets
> the data using different reference systems.
> Example1: the producer expresses time in Greenwich Mean Time (GMT),
> the consumer expects the time in Eastern Standard Time (EST).
> Example2: the producer provides directions by giving the distance
> to the town relative to the center of a known town, while the
> consumer interprets the distance relative to the outskirts of
> the known town.
> Category 2: Terminology Differences
> 1. Terminology mismatch: the producer and consumer use different
> terms to mean the same thing.
> Example: the producer uses the term f-stop, while the consumer
> knows it as aperture.
> Category 3: Knowledge of New Capabilities Differences
> 1. New type-of: a consumer may not be coded to understand data about
> a new class of thing.
> Example: a producer outputs data about a new type of Camera,
> an Xj3-SLR. The consumer understands Cameras, but not an
> Category 4: Amount of Data Needed Differences
> 1. Differing expectations of completeness: the producer and consumer
> may have different ideas on what constitutes a complete set of
> Example: the producer provides the address to the Prudential Tower
> in Boston as Prudential Tower, Boston, MA 02215, while the
> consumer expects the address to also include the street address.
> That's what I have thus far. Anything that you could add would be
> appreciated. /Roger
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