What would be the correct sequence of activities for measuring transactional functions?

What would be the correct sequence of activities for measuring transactional functions? 1. Classify each transactional function as an EI, EO or EQ 2. Identify each elementary process required by the user 3. Determine the functional complexity for each transactional function 4. Determine the functional size for each transactional function 5. Count FTRs for each transactional function 6. Count DETs for each transactional function