The best replacement for network diagram is wbs.

The best alternatives to network diagram are rated as following:
★★★★★  wbs
★★★★★  gantt chart
★★★★★  pert chart
★★★★  critical path
★★★  bar chart
★★★  pert
★★★  work breakdown structure
★★  logical
★  chart
  gantt
  precedence diagram
  physical network diagram
  logical network diagram

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Speaking about network diagram, one probably shouldn't forget about critical path.

Other search terms related to network diagram and their ratings are:
★★★★★ critical path
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network diagram
wbs
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