Step 6 :

Program maintenance

(Step 6: Program maintenance)

< Program maintenance >

is designed to ensure that

the program operates

correctly,

efficiently,

and effectively. 

Two categories of maintenance activities are the following:

1.  Operation.

2.  Changing needs.

Operation.

Operation activities concern on

locating

and 

correcting operational errors,

making program easier to use,

and 

standardizing software

using structured programming techniques. 

For properly designed programs,

these activities should be minimal. 

Changing needs.

Organizations change over time

and

their problems must change with them. 

Agile development starts with core program functionality

then,

expands until customer is satisfied with results.

(Maintenance programmer)