Level 0 Diagrams (LDFDs/ DFDs)

Hand out pages pages 23-34 only
Homework (Introduction) Read P. 23-34 and complete activity 3.1

• Alternative ways to identify components include
  
• create a chart with 5 columns and add items as you read the case
• use symbols around words as reading circle around processes, square around entity, three sided rectangle around data stores and arrows under data/ informtion flows.
• Common mistakes include adding the person following procedures and an entity. An entity must provide data to system and/ or use information to the system. Usually, cashiers, secretaries, receptionists, etc are NOT entities
  

As a class read and draw Level 0 diagram for Brindabella Case on p. 16. When done hand out p. 35 with answers

• Why do we have a members and activities data store?

Students individually (or in pairs) to create Level 0 for Westside Videos p. 17

• Trade papers, hand out page 36 and check
  
• They may have an additional data store for loans
• Ask the following questions:
• How did they identify components? - highlighting, chart, symbols?
• What do you put in the Level 0 first?
• Then what do you put in?
• How did you check your LDFFD?

Hand out page 37. Students create LFDF for EVITSA. Swap papers and mark.

Homework activity: 3.2- 3.4

Correct in next class (have individual students put up on board)

In class do 3.5 and 3.6