Possibly save 1 hour of your time: There are three types of parameters in SSIS that you can configure to use by your packages.
- Project parameters
- Package parameters
- User variables
You can access project parameters from the Team Explorer >> Project.params.
Next you can access the package variables by double clicking the package to open the designer and choose tab Parameters.
Finally, you also have user variables. You can right click on the Control Flow designer and choose User Variables.