TYPE - Can be local or global. Local types are internal to the program. Global types can be accessed from the ABAP data dictionary by any program.

DATA - Defines fields and tables and their technical attributes for internal use in the program (internal variables).

LIKE - Defines a field with the same technical attributes as a reference field from the data dictionary.

PARAMETER - Issues a selection screen for user input.

TABLES - Defines the interface table between the code and the presentation screen.

WRITE - Issues an output to the screen.

CLEAR - Resets the initial value.

REFRESH - Clears data from the object in the program.

COMPUTE - Carries out a calculation.

APPEND - Passes data from a work area to an internal table.

INSERT - Inserts data from a work area to an internal table.

READ - Reads data from an object.

MODIFY - Changes

DELETE - Deletes

COLLECT - Moves data into a work area.

SORT - Sorts

OCCURS - Reserves internal memory space in an internal program

DEFAULT - Adds a default entry into a field.

MESSAGE - Message statements are added when conditions are not met.