Lec 5

Question 1

changing the software is inevitable when:

• __________________________.
• __________________________.
• __________________________.
• __________________________.

Answer 1

• New requirements appeared.
• Errors must be repaired.
• We need to improve the performance , reliability of the system.
• Business environment changed.

Question 2

what is Evolution?

Answer 2

stage of software system’s life cycle to improve it as new requirements are proposed and implemented.

Question 3

What is Servicing?

Answer 3

stage of software system’s life cycle to fix it from bugs and change environment.
(no new requirements added)

Question 4

What is Phase-out?

Answer 4

stage of software system’s life cycle that the software still used and no changes made.

Question 5

Software evolution processes depend on :-

• ________________________
• ________________________
• ________________________

Answer 5

• Type of software.
• Development processes used.
• skills and experience of the people involved.

Question 6

Write three Urgent change requests:-

• _________________________
• _________________________
• _________________________

Answer 6

• serious system fault.
• changes to the system’s environment (e.g. OS upgrade).
• business changes that require fast response (e.g. competing product released).

Question 7

Agile methods and evolution:-

Agile methods are based on ________________________________________.

Answer 7

incremental development so transition from development to evolution is smooth.

Note: regression testing is valuable when changes made to the system.

Question 8

state two handover problems:

Answer 8

• when developers use agile method and the evolution team prefer plan-based approach.
• when developers use plan-based approach and the evolution team prefer agile .

Question 9

What is Program evolution dynamics?

Answer 9

study of the processes of system change.

Question 10

Lehman’s Laws is applied to all systems as they ______________.

Answer 10

evolved

Question 11

Lehman’s laws:-

1- Continuing change:______________________________________.

Answer 11

software used in real-world environment must necessarily change.

Question 12

Lehman’s laws:-

2- Increasing complexity:______________________________________.

Answer 12

As evolving any software it becomes more complex.

Question 13

Lehman’s laws seem to be generally applicable to __________________.

Answer 13

large systems