The link
A cross connection is any actual or potential connection between a drinking water system and another supply or source that could contaminate it. EPA also describes backflow as flow into potable water pipes from a source other than the intended source, with backsiphonage caused by negative pressure in those pipes.
The program, not this app
Cross connection control is a program activity that can include authority, backflow preventers, tester and specialist credentials, detailed records, and education. USC FCCCHR also says training tools are part of that work, including the Manual of Cross-Connection Control. For related reading, see backflow assembly test, backflow tester certification, glossary, and features.
Backflow Record is for storing a user filled in backflow test report as a record. It does not issue a credential, and it is not a water supplier form. The app can help keep notes and reports organized while the local water supplier or program sets the interval for the work.
EPA's Cross-Connection Control Manual from February 2003 also lists six basic means used against backflow: air gaps, barometric loops, atmospheric and pressure vacuum breakers, a double check with an atmospheric vent, double check valve assemblies, and reduced pressure principle devices.
Where a psi figure is used in the manual, it is a criterion in that manual, not a result from this app.
Related notes
Cross connection control relies on local program rules, training, and records. Backflow Record supports the record side of that process for users who want a place to store completed reports.
A report in Backflow Record is a record you fill in. It is not a substitute for a licensed tester or for the form your water supplier requires. It does not report an inspection result, and it does not mean a plumbing rule was met.