Extra info Flashcards

1
Q

What is the System Development Life Cycle

A

System Development Life Cycle (SDLC) is a process used by the software industry to design, develop and test high quality software

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2
Q

Stages of SDLC

A

PLANNING: This is the first stage in the System Development Life Cycle (SDLC). The purpose of this stage is to identify whether or not a new system is required.

ANALYSIS: The needs of the end users is analyzed to ensure that the new system can meet their expectations. It involves detailed understanding of all important facts of the business area under investigation or feasibility

DESIGN: In this process the primary object is to identify user requirements, specifications and to build a system that satisfies these requirements.

DEVELOPMENT: This phase is where the real work begins; the start of productions. Development is a phase where detailed design is used to actually construct and build the system

TESTING: Testing is a process of making sure that the program performs the intended task. Once the system is designed it should be tested for validity, normally by Quality Assurance (QA) Professionals. During this phase the system is used experimentally to ensure that software does not fail and it will work according to its specification. It is tested with special test data.

IMPLEMENTATION: Implementation is the process of converting from the old system to the new system. This phase of development consists of installing hardware, programs, collecting data and organizing people to interact with and run the system. In this phase user actually starts using the system therefore it also involves training of users and provides friendly documentation.

REVIEW: It is the process of incorporating changes in the implemented existing system.

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3
Q

What are ER diagrams

A

–Entity Relationship (ER) diagrams, also known as ERDs or ER Models, refers to a type of flowchart that illustrates how entities, such as people, objects or concepts relate to each other within a system

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4
Q

What is the BIG BANG MODEL

A

The Big Bang model is a software development life cycle (SDLC) model that focuses on software development and coding with little to no planning

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5
Q

What is the V Model

A

The V-model, also known as the Verification and Validation model, is a software development process that organizes the development life cycle into a V-shape, with each development stage corresponding to a testing phase.

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6
Q

What is a Decision Tree?

A

Decision trees- A decision tree is a graph that uses a branching method to illustrate every possible outcome of a decision

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7
Q

What are programming languages?

A

Programming languages- A programming language is a set of rules that provides a way of telling a computer what operations to perform. Programming languages allows humans to communicate with computers.

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8
Q

What are CASE tools (omg caseoh)

A

Computer-aided software engineering (CASE) tools- CASE tools are set of software application programs, which are used to automate SDLC activities. CASE tools are used by software project managers, analysts and engineers to develop software system.

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9
Q

Components of a MANUAL info system

A
  • Collate- After the information has been collected, it is then combined and organized;
  • Analyze- This is when the information begins to process, that is, the details of the data gathered is examined and converted into something meaningful.
  • Present- Presenting refers to putting the data gathered in a useful form, in order to gain meaning output.
  • Disseminate- This is when the outputted information is distributed.
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10
Q

Components of a AUTOMATED system

A
  • Input (data capture or entry)- This is when raw data is entered into the computer for processing.
  • Process (for example, analyze, sort, calculate)- Once data has been inputted into the system, it then begins to process to become meaningful information.
  • Store- The processed data is often stored or put away to be used at a later data.
  • Retrieve- Retrieval stage is accessing the information that was previously stored.
  • Output (present and disseminate) - This is when information has been displayed as either softcopy or hardcopy.
  • Feedback
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11
Q

Examples of Transaction Processing Systems

A
  • Automated Teller Machines (ATM)
  • Airline Reservation systems
  • Payroll System
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12
Q

Examples of Office Automation System

A
  • Message Handling Systems
  • Office Support Systems
  • Teleconferencing Systems
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13
Q

What is a Knowledge Works System

A

Knowledge Work systems (KWS)- is a computer-based application crafted to assist employees in processes such as capturing, developing and sharing knowledge in the organization

Examples:
* Virtual Reality Systems
* Computer Aided Manufacturing
* Investment Workstations

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14
Q

What is Executive Support Systems

A

Executive Support systems (ESS)- is a software that enables the users to convert basic company data into executive-level summary reports. Some may consider this as another form of decision support system

Example: * Meditech
* Corporate Management
* Cambridge Systematics

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15
Q

What is a Group Decision Support System

A

Group decision support system (GDSS) technology assists in the project collaboration component of groups by improving the digital communication aspect using the tools and resources available

Examples: * File Drawer System
* Microsoft Exchange
* Meeting Sphere
* Group Decision Room

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16
Q

What is the bus topology

A

Bus Topology
In the bus topology, single cable connects all network nodes without affecting connectivity devices. When one computer sends a signal using the cable, all the computers on the network receive the information, but only one (Addressee) accepts it

17
Q

Advantages and Disadvantages of Bus topology

A

Advantages of Bus Topology

  1. The bus is simple, reliable in very small network, and easy to use.
  2. The bus requires the least amount of cable to connect the computers together and is therefore less expensive than other cabling arrangements.
  3. Failure of one node does not affect the rest of network.

Disadvantages of Bus Topology

  1. Heavy network traffic can slow a bus considerably.
  2. A break in the cable or lack of proper termination can bring the network down.
  3. It is difficult to troubleshoot a bus.
18
Q

What is the star topology

A

A design where a central node extends a cable to each computer on the network

19
Q

Advantages and Disadvantages of the star topology

A

Advantages of Star Topology

  1. It is easy to modify and add new computers to a star network.
  2. During the process of adding/deleting a node (computer), network can function normally.
  3. Single computer failure do not necessarily bring down the whole star network.

Disadvantage of Star Topology

  1. If the central hub fails, the whole network fails to operate.
  2. It cost more to cable a star network.
  3. Require dedicated server
20
Q

What is the ring topology

A

Computers are connected via a single cable but the end nodes are connected to each other

21
Q

Advantages and Disadvantages of the ring topolgoy

A

Advantages of Ring Topology
1. All the computers have equal access to the network.
2. Even with many users, network performance is even.
3. Allows error checking, and acknowledgement
Disadvantages of Ring Topology
1. Failure of one computer can affect the whole network.
2. It is difficult to troubleshoot the ring network.
3. Adding or removing computers disturbs the network

22
Q

Layers of TCP/IP

A

1) Physical Layer :
the physical layer is responsible for the physical transmission of data between systems.
the physical layer ensures that data packets are correctly transmitted over a physical medium, such as a cable.

2) Data Link Layer:
the data link is responsible for packing data frames and handling their transfer between two nodes.
this layer is also known as layer two in the osi model.
it is responsible for error detection and correction ensuring data frames are not corrupt during transmission.

3) Network Layer :
the network of the tcp/ip model is responsible for routine packets to their destination.
it handles addressing ensuring that each packet is sent to the correct system.

4) Transport Layer :
this layer is responsible for providing reliable end to end communication between two systems.
it handles flow control ensuring that data packets are sent at a reasonable rate and not dropped during transmission.

5) Application Layer
the application layer is responsible for providing services to applications that use the underlined protocol for communication.
this includes : email, web browsing, file transfer, streaming media and more.

23
Q

Strategic information systems?
This is the HIGHEST level of management

A

ESS (Executive Support System)-ESS is designed to incorporate data about external events such as new tax laws or competitors, but they also draw summarized information from internal MIS and DSS.

DSS (Decision Support System)- aids the process of decision making.

24
Q

Tactial information systems?

A

ES (Expert Systems)-An expert system is a computer program that uses artificial intelligence (AI) technologies to simulate the judgment and behavior of a human or an organization that has expertise and experience in a particular field.
DSS
MIS- MIS is an application of computer related technology to programs. It provides managers with information and support for effective decision-making and provides the feedback on daily operations.

MIS is used for routine decisions, while DSS is used for complex decisions. MIS focuses on structured problems, while DSS supports semistructured and unstructured problems

Structured information is organized and defined, while unstructured information is not. Structured information is searchable and fits into data tables, while unstructured information is more difficult to search and doesn’t fit into data tables

25
Q

Operational Information Systems?

A

KWS-Knowledge work systems

OAS- Office Automation System: An Office Automation System (OAS) is a combination of networked software and computer hardware that allows data to move between systems without human intervention.

26
Q

Non Managerial Info System?

A

Transaction processing system