Step Four is supposed to be a complete moral inventory.
The instructions as they stand in the Big Book will catch most defects (defective beliefs, thoughts, and actions), but there is a gap.
The questions that elicit the defects are chiefly those in the 'fourth column' (the questions in the middle of page 67) and those in the sex inventory (on page 69). However, if an area of one's life does not trigger substantial resentment and does not involve sex, defects can be missed because there is no question that elicits them.
To remedy this, take the page 67 questions, which according to the Book should be applied to the items on the resentment list, and apply them to the following areas (in as far as they are not covered elsewhere in the inventory):
(1) Work and study
(2) Community and society
(3) Religion and God
This can then act as the basis for a wholesale redesign of these areas under God's guidance.