To have a good calculation of the schedule, it is necessary to enter predecessors and successors to all tasks except the first one which should never have a predecessor, and the last one which should not have any successor.
It is necessary to enter only technical links and not arbitrary sequences.
It must be ensured that each task has a successor with an FS link (Finish to Start), to allow a good calculation of the network. The preferred links are FS - x days rather than SS + x days or FF.
This becomes important when actual dates are entered in the updates.
Summary tasks should not have any links, this will create a faulty calculation.
