The logical type enables a field to have one of two logical values. Ability has four ways of expressing logical values: True/False, Yes/No, On/Off, 1/0.
The formatting properties available on the General page are:
Initial Value (enter a default value that will automatically appear in this field every time a new record is created, unless you overwrite it with another logical value - Initial value)
Caption (enter a caption to replace the field name above the column in Table View - see Captions)
Validation Rule (set a rule to validate possible data entries - see Validation rule)
Validation Text (write a display message for cases of invalid data - see Validation text)
Required (when checked a value is required in field - see Required property)
Index (choose from Primary Key, Indexed, No Index & Indexed (Unique) - see Indexes and primary keys)
You can choose the type of logical value on the Format page:
In the Values box choose from Yes/No, True/False, On/Off, 1/0
Once you go to Table View each new record will display the negative logical value by default i.e. False or No or Off or 0. To select a positive logical value, click on the arrow in the field and select it. Alternatively, at the formatting stage, you can choose the positive value as the default in the Initial Value box.