a straight line
a number enclosed in a circle or a square
a straight line with circles at the ends
a dotted line
all activities should be numbered
only important activities should be numbered
only critical activities are numbered
only selected activities are numbered
ahead of schedule
beyond schedule
as per schedule
on critical path
the maximum time which an activity might require
the average time required for a job
the most probable time considering all conditions
the minimum time in which an activity can possibly be accomplished
#NAME?
zero slack
dummy activities