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Network Scheduling Technique


Network diagramming is a method for planning, controlling, and monitoring projects and processes. It enables the visualization of tasks and workflows in the form of a network diagram, which represents the dependencies between the individual activities. Through this representation, critical paths can be identified, and resources can be optimally utilized. Network diagramming is an important component of project planning in many areas such as construction, manufacturing, software development, or event management.

Introduction to Network Diagramming

Network diagramming is a management tool developed in the 1950s for planning, controlling, and monitoring projects and processes. It is based on the graphical representation of activities and their dependencies in a so-called network diagram that maps out the temporal and logical structure of a project. Network diagramming enables efficient determination of critical paths that early indicate bottlenecks and schedule risks, as well as the optimization of resource allocation and coordination.

Basics of Network Diagramming

A network diagram consists of nodes and edges that represent activities and dependencies. The nodes symbolize the activities (e.g., tasks, processes, events), while the edges represent the dependencies between the activities. The activities are equipped with duration, resource requirements, and further information, so that the network diagram provides a comprehensive overview of the entire project.

Activities and Dependencies

Activities are the elementary components of a network diagram and can be tasks, processes, or events, for example. They are represented by nodes in the network diagram and contain information such as duration, resource requirements, and responsible parties. Dependencies are the relationships between the activities and determine the order in which the activities must be carried out. There are various types of dependencies, such as finish-to-start (FS), start-to-start (SS), finish-to-finish (FF), and start-to-finish (SF).

Critical Path and Buffer Times

The critical path is the path in the network diagram that has the longest total duration of activities. It is of particular importance as it determines the minimum project duration and thus the earliest possible completion date of the project. A delay in an activity on the critical path directly leads to a delay in the entire project. Buffer times, on the other hand, are temporal margins that exist for activities outside the critical path. They allow for some flexibility in planning and executing the activities without affecting the overall project.

Applications of Network Diagramming

Network diagramming is applicable in many different areas and industries and is often used for planning, controlling, and monitoring projects. Some examples of application areas are:

  • Construction (e.g., planning and coordination of construction projects)
  • Manufacturing (e.g., production planning, supply chain management)
  • Software development (e.g., project management, agile working)
  • Event management (e.g., planning and execution of events)
  • Logistics (e.g., transportation and storage planning)

Benefits of Network Diagramming

The application of network diagramming provides numerous advantages for the planning and execution of projects, such as:

  • Clear representation of activities and dependencies in the project
  • Identification of critical paths and optimization potentials
  • Efficient resource allocation and coordination
  • Early detection of bottlenecks and schedule risks
  • Optimization of time and cost expenditure


Network diagramming is an important tool for planning, controlling, and monitoring projects and processes. By visualizing activities and dependencies in a network diagram, critical paths can be identified, resources can be optimally utilized, and time and cost expenditure can be minimized. Network diagramming is suitable for a wide range of application areas and contributes significantly to the successful implementation of projects.