The Categories Section contains the Chemical Families field and the Applications field. The Chemical Families field lists those families to which the current entity belongs. The Applications field lists those applications for which the current entity is used.

Values from both the Chemical Families field and the Applications field are used in several places within Cranium and Synapse:

• The Compile Applications command found on the Chemicals Chapter's Commands menu will compile all chemicals for each application. For example, all chemicals in the current database that have "Refrigerant" as an application can be found. (See Compile Chemical Applications Dialog for more details.)
• The Compile Families command found on the Chemicals Chapter's Commands menu will compile all chemicals for each chemical family. For example, all chemicals in the current database that have "Chlorofluorocarbon" as a chemical family can be found. (See Compiled Chemical Families Dialog for more details.)
• Mixture design components can be added by application and chemical family. For example, you could specify one component in your mixture to be a biocide and then add all chemicals in the source knowledge base that has "Biocide" as an application.

Clicking the left mouse button within either the Families field's table control or the Applications fields's table control activates the categories edit dialog.

1	The dialog's table control displays the current list of categories. Clicking the left mouse button on a table row selects that table row. Clicking and holding the left mouse button down and then dragging the mouse will select several table rows.
2	Pressing the dialog's Edit button activates the category edit dialog. See below for documentation.
3	Pressing the dialog's Commands button or clicking the right mouse button on the table control displays the commands menu. This menu provides standard commands for copying, pasting, and clearing categories. See the documentation on Common Menu Commands for details.
4	The dialog's Sort button will be enabled if two or more rows are selected. Pressing the Sort button will sort the selected values alphabetically in ascending order.
5	Press the Add Rows button will add rows to the bottom of the table control.

1	In addition to the standard Text-Reference dialog functionality, the categories edit dialog also provides a List button. Pressing the List button will activate a dialog from which you can select standard chemical families or standard applications.

The Applications field and Chemical Families field are edited in the same manner.

1. Open a knowledge base document. (Open a "working" document or create a copy of a document (see here) if you are just experimenting with this functionality.)
2. Change to the Chemicals Chapter. (See documentation on Navigation Overview for details on navigating chapters and pages.)
3. Scroll down to the Categories Section and click the left mouse button in the Applications field's data entry table. The application activates the Chemical's Applications edit dialog.
4. Select an empty row and press the Edit button. The application activates the Chemical's Application edit dialog. (You can also double-click the left mouse button on any row to activate the dialog.)
5. Enter a value for the application. Clicking the right mouse button within the dialog's application edit control will display the commands menu enabling you to copy text, paste text, change case and insert symbols. (See documentation on the Symbol Dialog for more details.)
6. Pressing the List button displays a list of standard applications to choose from.
7. Optionally, but recommended, enter a value for the datum's reference and any relevant comments. Pressing the Date button will enter the current date and time into the edit control. Pressing the Phrase button will enter the currently stored phrase into the edit control. Pressing the Set button enables you to change this stored phrase. (See the Phrase Dialog documentation for more details.)
8. Finally press the edit dialog's OK button. The newly entered application will be added to the list of applications shown in the applications dialog.
9. Repeat the previous procedure to add additional applications or use the dialog's buttons to cut, paste and sort the listed applications.
10. Finally, press the Applications edit dialog's Save button to store the values in the document and display them in the Applications field.

Topic	Description
Estimating Chemical Properties	a short video demonstrating how to estimate the physical properties of chemicals using either Synapse or Cranium.
Getting Started using Cranium	provides a quick tour of Cranium's capabilities including a discussion of structure editing.
Getting Started using Synapse	provides a quick tour of Synapse's capabilities including examples of chemical product design.
Chemicals Chapter	the chemicals chapter contains numerous sections for entering and displaying data and estimates including the chemical structure section.