The systems development life cycle (SDLC) is a conceptual model used in project management that describes the stages involved in an information system development project.
Contents What is systems development life cycle (SDLC)? 2 Prototyping 3 Types of Software Prototyping 3 Wireframes/Paper Prototypes 3 Visual Prototypes 4 Wireframes/Paper 4 Interactive Prototypes 4 Benefits of Software Prototyping 4 Disadvantages of Prototyping 5 Insufficient analysis: 5 User confusion of prototype and finished system: 5 Developer attachment to prototype: 6 Excessive development time of the prototype: 6 Expense of implementing prototyping 6 Best projects to use Prototyping 6 When to use 7 Rapid Application Development (RAD) 7 Usage of RAD 10 Dynamic Systems Development Method 12 Critical Success Factors of DSDM 13 DSDM Model Limitations 14 DSDM Model Advantages 14 Waterfall model 15 Requirement Analysis & Definition: 16 System & Software Design: 16 Implementation & Unit Testing: 16 Integration & System Testing: 16 Limitations of the Waterfall Life Cycle Model 17 Advantages 17 Spiral model 18 Advantages 19 Limitation / Disadvantages 19 What is systems development life cycle (SDLC)? The systems development life cycle (SDLC) is a conceptual model used in project management that describes the stages involved in an information system development project. Even though the system is small, it is better to have a proper system development plan, not only because it helps to save the time and the money, but also because it has a proper
Principles of Computer Networks
BTEC National Certificate for IT Practitioners Unit 27 Principles of Computer Networks Assignment 1 Introductions In this assignment I am going to describe the types of networks available and how they relate to particular network standards and protocols and I am also going to describe, using examples, why different network standards and protocols are necessary LAN This is type of network which covers a small office, home or a school network. A LAN uses either wired Ethernet or wireless RF technology. Using a LAN can be much easier when there is a printer available or sharing a file throughout the network. Updating software is much easier because updating software will automatically update all the other software's. LAN has much higher transmission rates because it is wired connection rather than wireless. Ethernet and Wi-Fi as most widely used technologies, however many others such as token rings have been used before. This relates to standard IEEE 802.2. This standard allows two connectionless and one connection orientated operational mode: Type 1 which allows frames to be sent to a single destination or multiple destinations on the same network is a connectionless mode. Type 2 is the oriented operational connection mode. In this mode it uses something called sequence numbering which makes sure that when the data is send it gets to the destination in the correct
information systems assignment 2
Legislation Data Protection Act The Data Protection Act gives individuals the right to know what information is held about them. It provides a framework to ensure that personal information is handled properly. The Act works in two ways. Firstly, it states that anyone who processes personal information must comply with eight principles, which make sure that personal information is: * Fairly and lawfully processed * Processed for limited purposes * Adequate, relevant and not excessive * Accurate and up to date * Not kept for longer than is necessary * Processed in line with your rights * Secure * Not transferred to other countries without adequate protection The second area covered by the Act provides individuals with important rights, including the right to find out what personal information is held on computer and most paper records. Should an individual or organisation feel they're being denied access to personal information they're entitled to, or feel their information has not been handled according to the eight principles, they can contact the Information Commissioner's Office for help. Complaints are usually dealt with informally, but if this isn't possible, enforcement action can be taken. The Data Protection Act (DPA) is a United Kingdom Act of Parliament. It defines a legal basis for handling in the United Kingdom of information relating to people
Compilers and Interpreters
Compilers and Interpreters There are two types of translator for converting a high-level language such as Pascal into machine code; compilers and interpreters. These relieve programmers of the tedium and complexity of low-level programming and hence make programming considerably easier and less error prone. Compiler This type of translator takes the whole source code and compiles it into object code. The object code (sometimes called machine code) can then be run. Pascal is an example of a programming language that uses compilation. Interpreter This type of translator takes the source code and translates the first line of the program, and then executes it. It then does the second line, and the third line, until it gets to the end of the code. BASIC, LISP, Prolog and APL are examples of programming languages that uses interpretation. Compilers plus Interpreters. Some programs written in languages such as JAVA are both compiled and interpreted! A program is firstly compiled into an 'intermediate code'. It is then distributed to users who use a wide range of computers such as Mac or PCs. These computers then run their own 'interpreter' to convert the compiled code into a code they can use. Languages such as JAVA are said to be platform-independent, because any program written in that language can run on any machine. These types of languages are ideal for use on the
HCI shortened for Human Computer Interaction is the study of the human and computer and the way they interact. The interaction between human, whom may be referred to as users and the computer occurs at the users interface
P1 - Describe the impact of HCI on society, the economy and culture. Introduction HCI shortened for Human Computer Interaction is the study of the human and computer and the way they interact. The interaction between human, whom may be referred to as "users" and the computer occurs at the users interface, which simply means the way you input and output information. Society; The first interface that I will be looking at and its effect on Society is the online shopping - EBay. EBay is one of the world's online marketplaces with a global customer base of 233 million. EBay has created a powerful marketplace for the sale of goods and services by a passionate community of individuals and small businesses to exhibit. Below is an image of EBay. EBay offers different features such as allowing customers to create an account for its users, it gives clear stated categories in which people can easily search from and it markets people's product on the front page to advertise their product. It's impact on Society; EBay has impacted the society in the sense that people can now shop online with ease and not having to go out of their way to locate a shop to purchase items. It has given people opportunity to market their business and product. It also enables its user to communicate with one another for transaction. It has brought people from across the globe to purchase items and
An introduction to Identity Theft
An Introduction to IDENTITY THEFT Created By Ruth Sutton P06003790 INDEX Introduction Page 3 What is Identity Theft? 4 Prevalence and Statistics 5 The Criminal, Your Personal Information, Methodology & Tools 7 Card Skimming 7 Bin Raiding 7 Useful Documents 8 Shoulder Surfing 8 Spoof Means 8 Advance Fee & 419 Fraud 9 Corporate Identity Theft 10 Corporate Scams 10 Telesales Scam 10 Bogus Invoice Scam 10 Network Invasion 11 Affects on the Victim 12 Preventative Measures 13 The Victims Recovery 14 Conclusion 15 Bibliography 16 INTRODUCTION The purpose of this document is to explore and explain "Identity Theft", it will document some of the available statistics. It will report the sources of information, methodology and tools used by the criminal to carry out the offence, the affects on the victim, preventative measures, and finally the steps of recovery for the victims of Identity Theft. What is "Identity Theft" Identity Theft is the use of another persons, living or deceased or a company's (and its directors) personal and private information which is then used for the purposes of; * Assuming another's identity in all aspects
LAN & Topologies & Data Flow
BTEC National Certificate for IT Practitioners Unit 8 Communication Technologies Assignment 3 Introduction In this assignment I am going to list and describe the components that make up a LAN. I will also state how they can be interconnected and interact with each other. I will show some LAN topologies and illustrate them. Finally I will explain and describe how data travels around the various topologies and list the advantages and disadvantages of each topology. LAN I am going to look at the components that make the LAN and describe them. Ethernet, Hardware, NIC's, Hubs/Switches/etc these are the list of components that make up the LAN and now I am going to explain each of these components. NIC's - Network Interface Card are used for connecting a RJ-45 cable. Nearly all the modem PC's or PC's which connect through dial-up connection need a NIC. On either ends is a RJ-45 connector which then allows you connect to another computer on the network or another device. The NIC is interconnected to other hardware such as the motherboard; this allows it to communicate with the computer. There are 3 ways the NIC can be connected to the computer. As mentioned before it can be integrated on the motherboard, connected through a PCI slot or connected using a ISA slot (Industry Standard Architecture). For the NIC's to communicate with each other properly they need to have been
Designing a data system for a vintage clothes business.
Ross KennedyCandidate Number: 0518Centre Number: 22151 Computing Coursework Analysis Contents Computing Coursework . Introduction .1. Client Identification .2. Define the current system .3. Describe the problems .4. Section appendix 2. Investigation 2.1. The current system 2.1.1. Data sources and destinations 2.1.2. Algorithms 2.1.3. Data flow diagram 2.1.4. Input Forms, Output Forms, Report Formats 2.2. The proposed system 2.2.1. Data sources and destinations 2.2.2. Data flow diagram 2.2.3. Data dictionary 2.2.4. Volumetrics 3. Objectives 3.1. General Objectives 3.2. Specific Objectives 3.3. Core Objectives 3.4. Other objectives 4. E-R Diagrams and Descriptions 4.1. E-R diagram 4.2. Entity Descriptions 5. Object Analysis 5.1. Object Listing 5.2. Relationship diagrams 5.3. Class definitions 6. Other Abstractions 6.1. Graphs 7. Constraints 7.1. Hardware 7.2. Software 7.3. Time 7.4. User knowledge 7.5. Access restrictions 8. Limitations 8.1. Areas which will not be included in computerisation 8.2. Areas considered for future
Networking Diagrams and Case Study
Task 6: Networking Diagrams . A) Define: . Workstation – A computer or a dumb terminal that is connected to a network that inputs and outputs data and is often the ending point of a network, but not always. 2. IP Addresses - An IP Address is a multi-digit number assigned to each device in a network that uses the internet protocol (IP) to communicate. 3. Switch – A switch is a networking device that connects network devices. A switch is also commonly known as a network bridge that routes data at the data link layer (layer 2) of the OSI model. 4. Router - A router is a device that forwards data packets between computer networks. The router reads the address of the packet to determine where its final destination. 5. WAN/LAN – LAN is a network that connects computers in a smaller area such as a home. The difference between a LAN and a WAN are that a WAN is when two LAN’s are connected with a LEASED line that connects them. 6. Firewall – Can either be software or hardware-based and is used to help keep a network safe. Its main objective is to control the incoming and outgoing traffic as it analyzes the data packets and determining whether it should be allowed through or not. 7. Server/Proxy Server – operates on layer 7, 6, 3 of the OSI model 8. Star Network – One of the most common network topologies. A star network has one central switch/hub/computer, which
Equipment needed for a Graphic PC
Let's Help Jakub List . R.A.M Random Access Memory (RAM) is a form of computer data storage. The industry standard is around 4GB. RAM is important for graphic computers because if you have a low RAM it will not be able to cope with high resolution pictures and so you need more RAM. 2. HD Monitor A HD monitor has a high resolution, 1920 x 1080 pixels. It is important to graphic design because on a normal monitor you would not be able to see the picture properly. With a HD monitor the picture would be more clear and easy to see. 3. Graphic Card A Graphic card is an expansion card which generates output images to a display. The graphic card is responsible for generating all the text and pictures that are displayed on your screen. It is important to have a good Graphic card because so it can display high resolution images. A really good graphics card is easy to spot. It has lots of memory and a fast processor. 4. Processor The processor acts like the brain of the computer. It carries out the instructions of a computer program and it also performs the input/output operations of an operating system. You need a good processor for a graphics PC because it can process the images faster. 5. Hard drive The hard drive is needed to store images on the computer. A graphics PC needs a relatively big hard drive to store all the images. You would need at least 500 GB. 6.
