Carefully review and analyze the Level-0 DFD in Appendix A: the DFD illustrates (automated) Biketown Portlands bike rental process. This Level-0 DFD features 6 processes with 3 sources/sinks and 4 data stores.

Create Structured English for all processes if you use/make business rules/assumptions, state them clearly. Some processes in DFD may be written generally so that you must use your business process knowledge to prepare Structured English Some data elements in DFD may be described in generic terms on purpose and you can specify those using your knowledge of data and data modeling. Make (business assumption(s)) if you believe needed.

Appendix A Level-O DFD Verification result Personal credentials Credit Card Company Rider (without annual membership) 1.0 Receive credentials, verity credit card, & create annual membership C/C verification request Annual Membership CIC failure notice New membership ps1 Membership 2.0 QR code Rider (without annual membership) Update on bike Receive QR code & unlock the bike DS2 Bike No membership QR code Unlocked bike Membership credentials Rider (with annual membership) 3.0 Verification result Verify membership Membership failure notice Personal data Member status 4.0 Personal info Recieve rider data DS3 Rental Contract 5.0 Receipt Bike New rental cotract -Bike Create a new rental & start tracking a trip DS4 Charge Rate 6.0 Charge rate Returned bike Update on bike Invoice Lock the bike close a trip, claculate a charge & prepare invoice Returned bike Update on rental