https://community.intel.com/t5/Software-Archive/Modules-why/m-p/969064#M23520 Modules and .lib files are sort of apples and oranges. It's easier to think of modules as an improvement on INCLUDE files. A module allows you to have a self-consistent set of declarations, including constants, types, variables and routines, that is compiled separately. A USE statement makes the public declarations from the module available to your routine, and if you call module routines, the interfaces are checked (something you wouldn't get with just a .LIB file) You can restrict which names are visible from a module, select the names you want to import, and rename others. Modules can USE other modules, so you have nested inheritance.<BR /><BR />There are many other advantages of modules - I suggest reading a good book on Fortran 90 to learn more.<BR /><BR />Oh, by the way, .LIB files are a great place to put the object files created when you compile a module.<BR /><BR />Steve Thu, 11 Oct 2001 02:13:50 GMT Steven_L_Intel1 2001-10-11T02:13:50Z https://community.intel.com/t5/Software-Archive/Modules-why/m-p/969063#M23519 I've read the CVF documentation about Modules, including the advantages section. However, I'm still not sure about when to use them. Why use them over a .lib file for instance...? Am I missing something? Thu, 11 Oct 2001 00:05:55 GMT https://community.intel.com/t5/Software-Archive/Modules-why/m-p/969063#M23519 Intel_C_Intel 2001-10-11T00:05:55Z https://community.intel.com/t5/Software-Archive/Modules-why/m-p/969064#M23520 Modules and .lib files are sort of apples and oranges. It's easier to think of modules as an improvement on INCLUDE files. A module allows you to have a self-consistent set of declarations, including constants, types, variables and routines, that is compiled separately. A USE statement makes the public declarations from the module available to your routine, and if you call module routines, the interfaces are checked (something you wouldn't get with just a .LIB file) You can restrict which names are visible from a module, select the names you want to import, and rename others. Modules can USE other modules, so you have nested inheritance.<BR /><BR />There are many other advantages of modules - I suggest reading a good book on Fortran 90 to learn more.<BR /><BR />Oh, by the way, .LIB files are a great place to put the object files created when you compile a module.<BR /><BR />Steve Thu, 11 Oct 2001 02:13:50 GMT https://community.intel.com/t5/Software-Archive/Modules-why/m-p/969064#M23520 Steven_L_Intel1 2001-10-11T02:13:50Z