Week 3

Question 1

Information quality (Wand & Wang)

Answer 1

is conceptualized as fitness for use for specific purposes.

Question 2

Information quality is evaluated in which dimensions? (4)

Answer 2

1. Accuracy
2. Reliability / consistency
3. Timeliness (currency)
4. Completeness

Question 3

IQ: accuracy means?

Answer 3

Data represents the correct state of the real world.

example: Ashley and John have written a test. If we enter Ashley’s mark for John in the system, the mapping would be inaccurate.

Question 4

IQ: Reliability means?

Answer 4

Dependability of the output information, or correctness of the analyzed data.

Question 5

IQ: Timeliness (currency) means?

Answer 5

Whether the data is up-to-data, and available on time.

Question 6

IQ: completeness means?

Answer 6

Ability of the information system to represent every relevant state of the real world system.

Question 7

What are the three data abstraction levels

Answer 7

1. Conceptual level: used for understanding and communication
2. Logical level: how to structure data so that it becomes suitable
3. Physical level: how data is stored and transmitted

Question 8

Classification

Answer 8

An abstraction mechanism used to represent phenomena with common properties.

Question 9

Pre-defined classification (2)

Answer 9

Pre-defined:

• Reasons about the data using definitions provided by the data designer
• Assumes one correct classification scheme

Question 10

Non-classified classification (2)

Answer 10

1. Data instances and their properties stored without pre-defined classification.
2. Users define their own classifications based on properties of interest and demand.

Question 11

Resource description framework (RDF)

Answer 11

Store instances (things) and their properties