Chapter 5

How would you level DFDs?

By creating a lower level for balance, the next level is for exploding, decomposing, and partition.

How would you balance DFDs?

By making sure the parent DFD is in balance with the child DFD outputs must be the same.

Describe data and process modeling concepts and tools.

Data and process modeling tools consist of data flow diagrams, object modeling, and entity relationship diagrams Data flow diagrams use many symbols that show usage of input data. Used in agile development and analysis of business Object modeling is used for developing software and reducing complexity. Entity relationship diagram is a relationship between components of data and logical structure of the databases.

Describe a data dictionary and list the types of information it contains.

Data dictionaries are data repositories that are used for collecting facts and information. It contains processes, entities, data flows, data stores, data elements, and data structures.

Why would managers prefer a decision tree instead of a decision table?

Decision trees are a graphical representation of the actions, conditions, and rules.

What is structured English?

Structured English is regular English that language that helps describe the business logic and process.

What is the difference between a context diagram and diagram 0? Which symbol is not used in a context diagram?

The context diagram provides different views of information system. Diagram 0 is used to provide insight view of an info system represents internal process, entities, data flow, and data storage. Data stores are not used in a context diagram.

What is the purpose of of decision tables? How do you create them?

The purpose of decision tables is to show logical structures with their outcomes. You create decision tables is Word, Excel, and power point.

How would you explode DFDs?

You would need to create a lower diagrams using balancing and leveling techniques to ensure readability.