Activity diagrams are not exactly flowcharts as they have some additional capabilities. Use the scroll bar if you need to view the Description for each. This system was common for Windows 7 PCs. Visual Studio dev tools & services make app development easy for any platform & language.
Having a product owner with a higher perspective ensures that the team maintains a cohesive vision despite the flexible and often fast-paced nature of agile product (linked here) development. Everyone needs to be on the same page in order for a project to work effectively.