Help with dependent/independent list in SPSS

Hello All ,

I have to produce the result of the mean and the standard deviation
from a data sheet through SPSS ,basically in SPSS you have
two fields :
"dependent list"
"independent list"
Would someone know exactly the types variable you have to specify
for these fields ?
The variables of the datasheet are specified as follow :
- score of a pre-test group (students)
- score of a post-test group (students)
- type of instruction received
- student number

Many thanks in advance !