Chronological: (of a record of events) starting with the earliest and and following the order in which they occurred.
Chronological order is important in organizing a project planning document because a project needs to be completed in a particular sequence. All written work has an order. Writers need to find which order will make the written piece flow and make sense. In the case, the order in which a project is planned -starting from first step then to the last step- is important to the piece.
