Properties

Does the function or procedure name depend on parameter types (signature)?

Does the binding between signature and statement sequence depend on argument(s) (method)?

Which data types can a function deliver as a result?

Is recursion allowed, forbidden but detected, or simply forbidden?

Can global variables be changed by a subroutine?

Can subroutines be programmed in other languages?

Parameters

Can subroutines have parameters?

Which data types can be used for parameters and for arguments?

Which conversions are implicit, if any?

How are arguments and parameters related:

by value	argument value is copied
by value return	parameter value is copied back
by address	parameter aliases any argument
by reference	parameter aliases only l-value as argument
by name	effectively, text of argument is used in place of parameter

Does caller or subroutine decide how a parameter is passed?