Exam 4: Documenting Information Systems

Internal entities are included on both data flow diagrams (DFDs) and systems flowcharts.

External entities are persons, places, or things outside the context of the system.

A(n) ______________________________ process activities might include picking goods in the warehouse inspecting goods at the receiving dock, or counting cash.

How many circles (bubbles) are included in a correctly drawn context diagram?

When the context diagram and the level 0 diagram reflect the equivalent external data flows, the two diagrams are said to be ______________________________.

A(n) ______________________________ is a data flow that leaves a bubble but does not go to any other bubble or data store.

Bubbles are labelled with verbs in a ____________ data flow diagram.

Figure TB-4.3 shows a context diagram of a cash sales system. The diagram intentionally violates several of the guidelines and other techniques presented in the text for drawing data flow diagrams. Required: Identify as many of the errors in data flow diagram construction as you can. In the diagram, place consecutive numbers (each in a circle) next to the points at which the errors exist. On your solution sheet, list the numbers and write a one- to two-sentence description of each error and what the correct procedure should be. Error 1 is provided as an example of how to construct the solution (but you must place the circled number 1 on your solution diagram). $\underline{Errar}$ $\quad$$\quad$$\quad$$\quad$$\quad$ $\underline{Errar Description}$ 1 $\quad$$\quad$$\quad$$\quad$$\quad$$\quad$$\quad$$\quad$$\quad$ Data flows should not connect twa external entities. Depending on the extent of the $\quad$$\quad$$\quad$$\quad$$\quad$$\quad$$\quad$$\quad$$\quad$ system being analyzed, either the mail roum or the bark entity should be elininated $\quad$$\quad$$\quad$$\quad$$\quad$$\quad$$\quad$$\quad$$\quad$ or docurnented wrthin the system.

All of the following are "guidelines" for grouping activities in a level 0 DFD except:

A(n) ______________________________ is a graphical representation of a system that depicts a system's components; the data flows among the components; and the sources, destination, and storage of data.

A(n) ______________________________ is any action being performed by an internal or external entity.

When we document a(n) ______________________________ system, the central computer will have one data store/disk symbol.

A(n) ______________________________ data flow diagram (DFD) depicts what activities the system performs rather than how, where, or by whom they are performed.

System flowcharts use only four symbols.

In the top-down partitioning of process 3.0, the next level's process bubbles would be labeled (assuming there are four subprocesses):

In a physical data flow diagram (DFD), this is something within the system that transforms data.

Which data flow diagram (DFD) symbol portrays a source or destination of data outside the system?

In a data flow diagram (DFD), a(n) ______________________________ symbol represents a pathway for data.

Which data flow diagram (DFD) symbol is portrayed by two parallel lines?

Figure TB-4.7 shows several systems flowchart routines that intentionally violate good flowchart construction procedures. Required: Redraw each of the routines so that they conform to the guidelines and other techniques presented in the text for drawing systems flowcharts. HINT: Be alert to the description of each routine; the descriptions should govern your solution. (A) $\text { Manual Update to Accounts Receivable}$ $\text {Subsidiary Ledger}$ (B) $\text {Query Computer ized Accounts Receivable}$ $\text {Mastar Data}$ (C) $\text {Manual Preparation of a Customer Invoice}$ $\text {from a Shippina Notice}$ (D) $\text { Print a Report in Data Processing and Send it }$ $\text {to the Accounts Receivable Department}$ (E) $\text { Print a Report on a computer in the Accounts Receivable Department}$ (F) $\text {Update an Accounts Receivable Master}$ $\text { data (maintained on disk) from event}$ $\text {data on disk}$