Data Flow Diagrams

Draw a context level DFD (separate page) a Parent level DFD (separate page and see the five parent level processes indicated below) and a Child level DFD (separate page) showing just one Child level process related to the Renting Tapes & DVDs to Customers parent.

Vinny Vitales Retro Video Store

Vista Video, is a throw-back, retro style video store for people who do not wish to use Netflix or on-line cable downloads for movies. It purchases tapes and DVDs from a new vendor and rents them out to customers. It also sells new tapes and DVDs to customers and used tapes (excess stock) to a used vendor who deals in used tapes. Vista also wishes to analyze usage and trends.

The General Ledger, Accounts Payable, Accounts Receivable and Payroll functions have been taken care of by the purchase of an accounting software package and should not be included in these DFDs.

Regarding Data: (Data Stores)

In a recent conversation with Alice the Analyst, Vinny Vitale did mention several fields of data that he thought the system should have. They were:

Product ID, Product Type, Title, Movie Rating, Rental Fee, Sale price, Rentals YTD, Sales YTD

Customer last name, Customer First Name, Customer Number, Cust Street Address, Cust City, Cust State, Cust Zip, Cust Phone Number, Cust e-mail address, Cust Rentals YTD, Cust sales YTD, Cust YTD late fees

Vendor for Purchases as well as the Vendor for Sales of used products - Last Name, First Name, vendor Number for each.

Inventory - for each product - number originally purchased, sold and on hand.

Transactions - rental/sale date, customer number, fee, type of transaction, rental out date, rental return due date, actual return date, late fee.

Regarding Processes:

The parent level processes are:

-Store purchase of tapes & DVDs from the New vendor

-Renting tapes & DVDs to customers

-Selling new tapes and DVDs to customers

-Selling used material to the Used vendor

-Tracking product usage & trends

Show all data stores on the Parent Level DFD.