Ideas or steps are prioritized by the writer or speaker according to a hierarchy of value. When using the order of importance pattern of organization, information can be structured from most important to least important or least important to most important. Both structures would be considered as the order of importance text structure.
Example: The company has a clearly laid out hierarchy. All major decisions go through the president, who controls the entire operation, but most daily decisions go to the board. Beneath the board members are the regional managers, who oversee the branch managers, who run each local branch.
The Order of Importance organizational pattern can be difficult to identify alongside cause and effect and sequence text structures. In fact, in some cases one could use the same graphic organizer to represent information from an order of importance and sequence passage. The difference is subtle and must be inferred at times, but generally a sequential passage explains the steps that occur in a process.