Exam 5: Data and Process Modeling

____ maintains consistency among DFDs by ensuring that input and output data flows align properly.

In a DFD, the Gane and Sarson symbol for a data flow is a ____.

In a DFD, the Gane and Sarson symbol for an entity is a ____.

MATCHING Identify the letter of the choice that best matches the phrase or definition.a.balancing f.data dictionary b.structured analysis g.decision table c.leveling h.logical d.DFD i.data flow e.physical j.record -Model that describes how a system will be constructed.

MATCHING Identify the letter of the choice that best matches the phrase or definition.a.balancing f.data dictionary b.structured analysis g.decision table c.leveling h.logical d.DFD i.data flow e.physical j.record -Model that shows what the system must do, regardless of how it will be implemented.

-____________________ is a subset of standard English that describes logical processes clearly and accurately.

A data dictionary specifies a data element's ____, which is the set of values permitted for the data element.

Systems analysts call an entity that supplies data to the system a sink. _________________________

On what structure(s) is modular design based? Briefly define each of the structure types. 1. Sequence. The completion of steps in sequential order, one after another. One or more of the steps might represent a subprocess that contains additional logical structures. 2. Selection. The completion of one of two or more process steps based on the results of a test or condition. 3. Iteration. The completion of a process step that is repeated until a specific condition changes. An example of iteration is a process that continues to print paychecks until it reaches the end of the payroll file. Iteration also is called looping.Sequence, selection, and iteration structures can be combined in various ways to describe processing logic.

The primary purpose of pseudocode is to describe the underlying business logic of code. _________________________

-In the accompanying figure, the sequence structure is the completion of ____.

By showing processes as ____________________, an analyst can create DFDs that show how the system functions, but avoid unnecessary detail and clutter.

-A decision ____ is a graphical representation of the conditions, actions, and rules found in a decision table.

A decision tree is read from left to right, with the conditions along the various branches and the actions at the far left. _________________________

DFDs are balanced if each internal process is numbered to show that it is a child of the parent process.

In a data dictionary, some data elements have ____ rules, such as an employee's salary must be within the range defined for the employee's job classification.

-When a set of DFDs is created for a system, a(n) ____________________ is a process that consists of a single function that is not exploded further.

Two DFDs are leveled, for example, if the child diagram at the bottom has the same input and output flows as the parent process at the top of the diagram.

A disadvantage of the four-model approach is that the requirements of a new information system always are quite different from the current information system, especially when the proposal is based on new computer technology rather than a large number of new requirements.

Later in the systems design phase, you build a logical model that describes how a system will be constructed. _________________________