ITTO stands for Inputs, Tools and techniques, Outputs. PMI lists these elements for each of the 47 PMI processes that are part of running a project. (Each of the processes has an article in this wiki; the article lists the ITTO for that process.)

As in project management, some processes create outputs that are required inputs for other processes. This partially defines the order of the processes. If process X creates an output that is required by process A, then process X should occur earlier. (See sequence activities.)