Definitions

Deprecation means that when the field or parameter is used, GMAT will throw a warning saying that the field or parameter will be removed at a later date, but still works for now. The message should state which field replaces this one, if applicable.
Removal means that the field or parameter is no longer available in GMAT, and cannot be used.

Is there a third category? "Ignored" for fields and parameters that are simply ignored.

Key Questions

(The following apply to both fields and parameters.)

Deprecate the field if the following conditions are met:

If the field is used extensively in the test system (e.g. more than a couple days' work to rewrite the tests), OR
If the field is both operational AND available in a previous public release.

Recommendation for deprecation: remove after 2 releases or 1 year, whichever comes first.

If these conditions are not met, remove the field.

The table below shows all permutations of the key questions:

Intentionally available?	Publicly available?	Significant use by test system?	Is field operational?	Recommendation
?	?	?	?	Deprecate
?	?	?	?	Deprecate
?	?	?	?	Deprecate
?	?	?	?	Deprecate
?	?	?	?	Deprecate
?	?	?	?	Deprecate
?	?	?	?	Remove
?	?	?	?	Remove
?	?	?	?	Deprecate
?	?	?	?	Deprecate
?	?	?	?	Remove
?	?	?	?	Deprecate
?	?	?	?	Remove