I am trying to do a longitudinal analysis with a Repeated Measures ANOVA 2x2, with two groups (experimental and control group) and two times (pre and post treatment). 

First, I have followed the Longitudinal Processing Tutorial: 

1) I have 2 acquisitions per subject so, I created a subject template (BASE) for each pair of subjects

2) I created the two longitudinal runs

Now I am confused, because I don´t know wether I have to:

1) do a Longitudinal QDEC table with two columns (time and group)

or 2) create a FSGD File, (or a DOSS file?) and create the contrasts. 

If I have to create the FSGD file, Would this be OK? 

GroupDescriptorFile 1

Class Subject 1

Class Subject 2

Variables                               Tp1vsTp2.Gr1Exp                         Tp1vsTp2.Gr2Control

Input Subject1-tp1  Subject1            1                                          0

Input Subject1-tp2  Subject1           -1                                          0

Input Subject2-tp1  Subject2             0                                         1

Input Subject2-tp2  Subject2             0                                        -1

Contrasts: 

Were do I have to create the FSGD file? In subjects folder or inside qdec folder? 

The group descriptor file must be "subject1" "subject2", or should I introduce the specific names of the folders from the subjects of my study?

Thank you in advance, 

Maria.