11.1 Using the entity description for ‘Bill’, which is shown below, the case study scenario and the level 1 DFD, identify the events that will affect the ‘Bill’

entity during the lifetime of an entity occurrence.

Entity description:

Subscriber no Rental period no Bill date Bill amount Bill type Payment date Bill status Reminder date Disconnection notice date Bill type has the values:
Bill due Request Bill status has the values:
0 – Bill issued 1 – Payment made following bill 2 – Following reminder 3 – Payment made following disconnection notice.