Lec 6

Question 1

Software maintenance:

Answer 1

Modifying a software after it has been put into use.

Question 2

when we evolve Generic products we create _________________.

Answer 2

new versions from it

Question 3

Types of maintenance:-

• _________________________
• _________________________
• _________________________

Answer 3

• Maintenance to repair software faults.
• Maintenance to adapt software different environment.
• Maintenance to add to or modify the system’s functionality.

Question 4

usually Maintenance costs ______________ than development.

( Greater - Less )

Answer 4

Greater

Question 5

Maintenance costs depends on :-

• ______________________________
• ______________________________

Answer 5

• technical and non-technical factors.

- extent of corruption of the software structure.

Question 6

Maintenance cost factors:-

• _____________________
• _____________________
• _____________________
• _____________________

Answer 6

• Team stability
• Contractual responsibility
• Staff skills
• Program age and structure

Question 7

Maintenance prediction:

Answer 7

measure which part of the system cause problem and have high Maintenance cost.

Question 8

Change acceptance depends on ______________________________.

Answer 8

maintainability of the components affected by the change.

Question 9

Implementing changes degrades the system and ______________________.

Answer 9

reduces its maintainability

Question 10

Maintenance costs depend on_______________________________.

Answer 10

number of changes and costs of change depend on maintainability

Question 11

What is change prediction?

Answer 11

number of changes require to understand the relationship between the system and it’s environment.

Question 12

Factors of the relationship between system and it’s environment:-

• _____________________________.
• _____________________________.
• _____________________________.

Answer 12

• Number and complexity of system interfaces.
• Number of inherently volatile system requirements.
• The business processes the system used.

Question 13

Complexity depends on:-

• ____________________________.
• ____________________________.
• ____________________________.

Answer 13

• Complexity of control structures e.g. (if, loops).
• Complexity of data structures e.g. (array , tree , queue).
• Object, method and module size.

Question 14

process metrics:-
\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_.
\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_.
\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_.
\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_.

Answer 14

• Number of requests.
• Average time required for impact analysis.
• Average time taken to implement a change request.
• Number of outstanding change requests.

Question 15

What is system re-engineering?

Answer 15

Re-structuring part or all of legacy system without changing its
functionality.

Question 16

Advantages of re-engineering _________________ and __________________.

Answer 16

Reduced risk / Reduced cost

Question 17

Re-engineering process activities:-

• ____________________________.
• ____________________________.
• ____________________________.
• ____________________________.
• ____________________________.

Answer 17

• Source code translation (change the code to new language).
• Reverse engineering.
• Program structure improvement.
• Program modularization(Reorganize the program structure).
• Data reengineering(Clean-up and restructure system data.).

Question 18

What is re-factoring?

Answer 18

improve the system to slow down degradation.

Question 19

Reasons of “Bad smells” in program code:-

• _________________________.
• _________________________.
• _________________________.
• _________________________.

Answer 19

• Duplicate code.
• Switch (case) statements.
• Long methods.
• Data clumping (same group of data items re-occur in several places).

Question 20

Legacy system management:-

• ________________________.
• ________________________.
• ________________________.
• ________________________.

Answer 20

• Scrap the system completely and modify business.
• Continue maintaining the system.
• Transform the system by re-engineering.
• Replace it with a new system.

Question 21

Legacy system categories/types:- “4 types”

Answer 21

• Low quality - Low business value (should be scrapped).
• Low quality - high business value (should be re-engineered).
• high quality - Low business value ( scrap completely or Replace with COTS).
• high quality - high business value (continue with normal maintain).