Developing Information Systems

Question 1

What is a Data Dictionary?

Answer 1

A Data Dictionary is a table identifying and describing the nature of each data item. Data Dictionaries are used in many areas of system design, including the design of databases.

Question 2

What is a Context Diagram?

Answer 2

A diagram that shows the context of a scenario or system. Data entering and leaving the system.

Question 3

What are the security concerns to information systems?

Answer 3

Virus Attacks, Hackers, Theft, Unauthorised Faults, Software Faults

Question 4

What are the solutions to secruity concerns in information systems?

Answer 4

Passwords, Backup Copies, Physical Barriers, Anti-Virus Software, Firewall, Data Encripytion, Audit Trails.

Question 5

What is Analogue Data?

Answer 5

Continuous. Analogue data can take any value its range.

Question 6

What is Digital Data?

Answer 6

Discrete. Digital data is coded and represented as distinct numbers. Computers use binary digital data.