Your Trash Is My Trash(YTIMT) provides waste disposal services for several councils in Lahore, Pakistan. When a new client wants to establish service, the client calls the company's main office on the phone. An YTIMT employee collects the following information from the client: name, street address, city, state, post code, area code, telephone number, e-mail address. The employee gives the new client information regarding regular weekly service dates, special services provided by the company, fees and billing procedures. YTIMT bills its clients every two months in advance of the service; for example, bills are sent to clients at the beginning of January for the months of January and February. Initially, YTIMT does all its billing manually; they send out paper bills and collect payment from clients via cheque. Once service is established, a client can create an online account; the online account provides an option for paperless billing and a separate option for charging a credit card rather than paying with a mailed cheque. To create an online account, the client creates login credentials (username and password); they provide their YTIMT account number (provided on the invoice) and relevant credit card data (type of card, name, billing address, and security code). YTIMT's database uses the account number to look up the client's original information, then merges the new information with it.

Q1	What is the name of the data flow diagram level that provides the highest-level view of the YTIMT information system?
A1
Q2	How many processes will be shown in a context diagram for the YTIMT case above?
A2
Q3	YTIMT stores clients' information electronically. What symbol would the database file be represented as in a data flow diagram?
A3
Q4	YTIMT's manual billing process will be represented in a data flow diagram with what symbol?
A4
Q5	Assume YTIMT wants no more than three processes shown on its Level Zero data flow diagram. Name at least two processes you can identify from the case above on that level.
A5
Q6	How many data stores will be shown in YTIMT's Level Zero data flow diagram, and how should they be labelled?
A6
Now investigate the Level Zero diagram for YTIMT below . Compare the diagram to the narrative above and answer the questions following the diagram.

Client Online account information- Regular client information 3.0 Process Regular Online client information account 1.0 information Process Client database Service Information Billing information 2.0 Process -Payment