Calling a script from another script

I have a directory "/Dir". There is a script within "/Dir" called "Script.sh"
There is also a script within "/" known Script1.sh.

I would run the Script.sh from "/Dir". I would like to run the /Script1.sh from Script.sh, but i want /Script1.sh to run from "/".

How can i accomplish this thing?

Your script : Script.sh

#! /bin/ksh

<absolute path>/Script1.sh

I have done that but to no avail. Its running from /Dir rather than /

Why not change directory? Eg.

cd /
/Script1.sh