There are many rules, requirements, guidelines, and legal precedents for Construction Scheduling practice. This article summarizes some of the most common errors that I have seen throughout my career as a Scheduler, Schedule Analyst / Reviewer, and Claims Expert.
1) Level of Detail: a schedule that is not detailed enough offers limited usefulness in tracking and monitoring a project. In contrast, a schedule that is too detailed, gets convoluted, confusing, and difficult to track and monitor. In general keep durations of activities from 1 to 20 working days (limit one-day durations).
2) Incomplete Logic: Every activity in the schedule should have at least one Predecessor and one Successor. Note that the Start of the activity and the Finish of an activity must be logically tied to the schedule. The only acceptations should be the first and last activity in the schedule.