few general abap queries

1, How could we ensure that our programms run efficently?

2, What action we shouls take when a program is taking longer than exopected to develop?

3, what is the role of functional anaylist

4. charcterstics of a good program

5.purpose of unit testing and integiration testing

6.what is meant by doucment tool and its usees

7.generally how would we go aboutb for writitng a big programs and what are the proframence related issues

8.how could we conform the out of the report is exatly correct

9.what are the standerds we use to follow while coding the programs

10.how we do documentation? and deffernet ways and bestb ways

11.