Use responses from Survey in Experiment?

Thanks a lot, this seems to be exactly what I was looking for.
Just to clarify, I presume I can also var in a calculated variable, e.g. (from one of the template scales):
l: neuroticism
t: set
- mean $bfi.1 $bfi.2 $bfi.3

Then I could use in the Experiment:
var in neuroticism
and access it with &neuroticism

Hmm, I just realised, 'neuroticism' wouldn't be integer. Is there a way to convert that?

Thanks, that helps.

Just out of curiosity (no need to answer if you're busy):
Does this work because the 'mean' function automatically truncates decimal places (max 2 or 3 places) or because when you do 'var in neuroticism' it doesn't care whether there are decimal places or not, it just ignores them?

I was probably thinking too complicated in the sense that a variable 'neuroticism' is either of type 'int' or 'double' and, if the latter, couldn't be used for 'var in' even if it would be a whole number.

Sorry, but I can't get it to work. I used the following code, based on your suggestions above:
In Survey:
l: Age
t: textline
q: How old are you?
- {min=18,max=100,require} Your age in years:

Question: In the Survey, do I need to specify also the bit where it says "If you want to get information from calling link to the survey (in), or want to send information using the end URL (out)..." and the fields In: and Out:? I haven't specified anything here, because this seems to relate to something else.

In the experiment code, when I just add:
options
var in age

and later on
save [...] &age

I get an error message for the save command, that the global variable "&age" is not known.

Therefore, I changed the Options:
options
set &Age -999
var in &Age
(I've also tried var in Age, i.e. without "&")

And later in the trial
save [...] &Age

Then the -999 is saved in the output file, but not the value entered in the Survey.

I'm sure I'm missing something?

Unfortunately, it doesn't

In your example, the line in the task definition:
set &new_age &age

gives an error message:
ERROR: undefined_global_variable in line: 89
>>> set &nage &age
Problem: You use a global variable that has never been set. The name
of this variable in your script is called &age

It looks like the
"var in age"
command does not create/define a new variable 'age' That's the reason why I tried defining the variable before this:
options
set &age -999
var in age
[or]
var in &age
However, then &age just stays -999