For targeted threat modeling, it may be helpful to create additional data flow diagrams to support a specific use case. One example would be a diagram that looks at authentication separate and apart ...

It begins with the input of data or materials into the system ... needed and making any modifications necessary; and 5) Use the flow diagram and continuously update it as needed.

(1) The path of data from source document to data entry to processing to final reports. Data changes format and sequence (within a file) as it moves from program to program. See dataflow diagram ...