Because accounting and estimating software programs follow most contractors' existing manual procedures, the contractor has to adjust his operating procedures only slightly to benefit from computerization in these areas. Unfortunately, the same cannot be said of computer software for planning and scheduling. Compared with a person, a computer can calculate faster, make calculations more accurately and organize more information in its much larger memory. However, the computer by itself cannot obtain accurate input data. These data must come from the constructor, who must derive them from his own, accurate manual procedures. The steps essential to the preparation and use of effective manual and computerized construction schedules are summarized:

  1. Define activities
  2. Determine activity logic
  3. Determine activity duration
  4. Determine float or contingency durations for activities
  5. Obtain subcontractor input
  6. Draw the project schedule
  7. Perform schedule calculations
  8. Use computerized software to plan and manage resources
  9. Obtain field data to update schedule
  10. Make calculations to prepare a revised or working schedule
  11. Take steps to react to problems determined from analysis of schedule