Graphic presentations of activities which are plotted against time (calendar) that form a series of bars.
The length of the bar represents the duration, the start and completion of each activity.

Activities are represented by a series of arrows which start and ended on a node that collectively forms a network.
The tail of an arrow represents the start of an activity and the head of an arrow represents the completion of an activity.

Activities are represented by a series of nodes which is connected by an arrow that collectively forms a network. An arrow only represents the relationship between activities

Planning technique developed for repetitive construction works e.g. house building, Jetties, pylons, etc.
The method is based on establishing a required delivery program for the completed unit and determining the gangs of labour resources to meet the delivery schedule