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- 1Any object or event about which someone chooses to collect dataEntity
- 2some characteristic of an entity. Data item is also used interchangeablyattribute
- 3a relationship that exists between instances of the same entityrecursive relationship
- 4entity that inherits its primary key from more than one other entityassociative entity
- 5relationship where manny instances of an entity are associated with many instances of another entity. also called many to many relationshipnonspecific relationship
- 6Resolving Nonspecific Relationships1. a new associative entity is introduced
2. occasionally result from the failure of the analyst to identify the existence of other entities
3. introducing separate relationships - 7number that is assigned to something, no relation to the datasimple sequence
- 8commonly used approach in identifying an account number. Ex mailing label for a magazinealphabetic derivation code
- 9affords the ability to distinguish among classes of items. for it to be useful classes must be mutually exclusiveclassification
- 10extension of the sequence codeblock sequence
- 11direct substitution of one letter for another, one # for another, or one for a #cipher
- 12when it is possible to describe a product by virtue of its membership in many subgroups help describe it.significant digit subset
- 13human memory aid. any code that helps either a data entry person remember how to enter the data or a user to remember how to use the informationmnemonic
- 14code that allows us to reveal characters that we normally cannot input or view, the international organization for standardization (ISO)unicode
- 15Functions that an analysis or a programmer desires a computer to perform with datafunction
- 16Hardware Alternatives1. Buy new hardware
2. use cloud services - 17software alternatives1. create your own software
2. choose COTS software
3. use SaaS provider - 18Advantage and Disadvantage of software alternative for Custom software+
Innovation may give firm competitive adv
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ongoing maintenance - 19Advantage and Disadvantage of software alternatives for purchasing COTS Packages+
Increased Reliability
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must live with existing features - 20Advantages and Disadvantages of software alternative for using SaaS+
There is no need to hire, train, or retain a large IT staff
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security, confidentiality, and privacy concerns - 21Common Errors Made when drawing Data Flow Diagrams (DFD)1.Forgetting to include a dataflow or pointing an arrow in the wrong direction
2. Connecting data stores and external entities directly to each other
3. incorrectly labeling processes or data flow
4. including more than nine processes on a DFD
5. Omitting data flow
6. Creating unbalanced decomposition in child diagram. should have same I/O data flow as parent. - 22Physical Considerations in HCI Design1. length of distance from display to person performing a task.
2. angle of display in relation to the person viewing it. - 23Choosing and Evaluating Interfaces List of standards1, Necessary training period should be short
2. the time to bounce back from errors should be short - 24Minimal User Action was to minimize key strokes1. entering only data that are not already stored on files
2. using default values for fields on entry screen - 25standard operation and consistency ways to achieve consistency1. canceling a transaction in consisten way such as Esc key
2. Exiting each program by using same key or menu option
3. standardizing the colors for all displays or web pages
4. obtaining help in a standardized way such as function key - 26Recommendations for designing apps for smart phones1. be an original
2. design for variety of devices
3. design the output a second time for different orientation
4. design your icon
5. design the logic - 27Put 7 steps of Six Sigma in Order1.Define the problem
2. Observe the problem
3. analyze the causes
4. act on the causes
5. study the results
6. standardize the changes
7. draw conclusions - 28useful in programming, involves breaking the programming into logical manageable portions or modulesmodular approach
- 29should be so that it is changed with accomplishing only one functionfunctionally cohesive
- 30recommended tool for designing a modular, top-down system.structure chart
- 31analyst should keep this coupling to a minimum the fewer data couples and control flags one has in the system the easier it is to changedata couples and control flags
- 32group of services that can be called upon to provide specific functionsservice oriented architecture (SOA)
- 33the burden of connecting services in a useful fashion is placed on a systems deesignerorchestration
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- Fichas sobre Sin título, creado por Matthew Butts el 22/04/2015.
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- Matthew Butts
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