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This online guide from Holland & Holland Enterprises provides a detailed breakdown of the creating network diagrams including a range of different methods including examples.
'Creating a network diagram, also referred to as a logic diagram, is a great way for starting to understand and visualise how your project will proceed. It's a simple concept successfully used in applications outside of project management planning; commonly used in manufacturing industries, as well as service industries requiring to map and understand work flows.' (Holland & Holland 2013)