Although the linked bar chart tries to incorporate the good qualities
of bar charts such as being simple to understand with the logic
relationships of CPM, its main weakness is that it can generate link
maze (i.e., activity links crisscrossing over each other in a complex
fashion). This can create difficulties in identifying the relationships
between individual activities and links to an activity that does not
start at its earliest time, especially for projects involving a complex
sequence of activities.