network

a network is a logical and chronological graphic representation of the activities composing a project.

• arrow-precedence
• node

arrow networks-arrow disgramming method(ADM)
acticity on arrow(AOA) networks, I-J method: each activity is identified by the two nodes that define its start and end

predecessor activity
successor activities

dummy activity: a fictitious activity inserted in an arrow network to maintain proper logic distinguish activities's identities.

redundant