Software Evolution

Question 1

Evolution

Answer 1

• The stage in a software systems life cycle during which it is in operational use and is evolving as new requirements are proposed and implemented in the system

Question 2

Software change

Answer 2

• Key problem to organize and manage in an organization

Question 3

Servicing

Answer 3

• The stage in a software system’s life cycle during which the software remains useful, but the only changes made are those required to keep it operational, i.e., bug fixes and changes to reflect changes in the software’s environment—no new functionality is added

Question 4

Phase-out

Answer 4

• The stage in a software system’s life cycle during which the software may still be used, but no further changes are made to it

Question 5

Change

Answer 5

• Driven by system evolution
• Continues throughout system lifetime

Question 6

Change implementation

Answer 6

• Iteration of design, implement, and test

Question 7

Agile and evolution

Answer 7

• Incremental-based, so evolution is no different than development

Question 8

Legacy systems

Answer 8

• Systems that rely on obsolete languages and technologies

Question 9

Legacy system replacement

Answer 9

• Scrap system
• Continue to maintain system
• Transform system
• Replace system

Question 10

System replacement analysis

Answer 10

• Assess system quality
• Assess business value

Question 11

Maintenance costs

Answer 11

• 2–100 times as much as development costs

Question 12

Complexity metrics

Answer 12

• Determine maintainability by complexity of system components

Question 13

Software reengineering

Answer 13

• Recreate new system from a legacy system

Question 14

Refactoring

Answer 14

• Improving program to slow down degradation

Question 15

Bad smells in program code

Answer 15

• Duplicate code
• Long methods
• Data clumping
• Speculative generality