CNEN Ch.9

late finish - duration =

Late Start

network diagram

a common type of construction schedule, also called the critical path method (CPM), which depicts a continuous chain of activities showing both activity durations and the relationship of the activities. There are two types of network diagrams: activity on arrow (AOA) and activity on node (AON)

mini-schedules

basically, a mini-schedule is any portion of a summary or detailed schedule broken down into even finer detail. Sometimes a particular division or area of work requires more scrutiny regarding the various activities needed to accomplish the work

detailed schedules

detailed schedules break major work activities down into smaller tasks down into smaller tasks so the schedule can be analyzed in greater detail

ES+ duration =

early finish

float =

late finish - ES or LS - ES

special-purpose schedule

some schedules are used to keep track of activities that support the work, such as delivery schedules, submittal schedules, and inspection schedules.

summary schedules

summary schedules group activities under broader headings such as mobilization, site work, foundation, and rough framing

late finish

The latest date an activity can complete without impacting the project end date.

late start

The latest date an activity can start without impacting the project end date.

critical path

The longest path through a network diagram schedule and includes those activities that have zero days of float. The critical path determines the overall project duration

network logic

The order in which activities are sequenced in the network diagram relative to their interdependent relationships

gantt charts

(also called bar charts) Considered revolutionary when Henry Gantt first published this planning tool around 1910, a Gantt chart is a type of bar chart that illustrates a project schedule. It illustrates the start and finish dates of the various activities of a project

precedence diagramming

A graphic presentation of a schedule depicting project activities on a node with an arrow that depicts the dependencies that exist between the activities.

forward pass

A scheduling technique used to calculate an activity's early start and early finish. The forward pass must be completed before the project duration can be determined.

backward pass

A scheduling technique used to calculate an activity's late start and late finish.

short-interval schedules

Also called look-ahead schedules, they are typically prepared by superintendents and focus on a relatively short periods of time, such as 2-4 weeks. These schedules are usually provided to trade contractors and focus on specific areas of work in greater detail than is provided in the overall project schedule.

float

The amount of leeway available to start or complete an individual schedule activity before it affects the planned project completion.

early finish

The earliest date an activity may finish as logically constrained by the network diagram.

early start

The earliest date an activity may start as logically constrained by the network diagram.