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# About Problem Types

When GiD is to be used for a particular type of analysis, it is necessary to predefine all the information required from the user and to define the way the final information is given to the solver module. The communication between GiD and the solver module is done with text files.

We call Problem Type to this this collection of files used to configure GiD for a particular type of analysis.

The files that configure a Problem Type are:

- directory name: `problem_type_name.gid`

- directory location: `c:\a\b\c\GiD_directory\problemtypes`

  NOTE: In versions previous to 6.0 the `problemtypes` directory does not exist, so your problem type must reside in the `GiD_directory`. In versions later to 6.0 it's recommended to put your problem type inside the `problemtypes` directory.

- Configuration files
  - `problem_type_name.cnd Conditions definitions`
  - `problem_type_name.mat Materials properties`
  - `problem_type_name.prb Problem and intervals data`
  - `problem_type_name.uni Units Systems`
  - `problem_type_name.sim Conditions symbols`
  - `***.geo Symbols geometrical definitions`
  - `***.geo Symbols geometrical definitions` ...

- Template files
  - `problem_type_name.bas Information for the data input file`
  - `***.bas Information for additional files`
  - `***.bas Information for additional files` ...

- Command execution files
  - `problem_type_name.bat Operating system shell that executes the analysis process`

- TCL extension files
  - `problem_type_name.tcl Extensions to GiD written in the TCL-TK programming language`

  NOTE: The TCL extension files might be used to add expandability and total control to your problem type. With the TCL/TK language it is possible to add new windows, menus or new functionalities to the program.

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