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Introduction to information skills and system. An information system is a system that accepts data (raw material) as input and information (organised data) as output. Examples include a computer, searchable databases etc. An information system is shown be

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Introduction

Introduction to information skills and system - Information system in context: A system is a collection of devices that works together to archive a particular purpose. Examples include transport system, school system, digestive system etc. A system can be represented as following: Input - contribution to processing of system Control - commanding processing unit Processing - transforming input to output Storage - where content can be put away and retrieved for later use. Output - the outcome of this system An information system is a system that accepts data (raw material) as input and information (organised data) as output. Examples include a computer, searchable databases etc. An information system is shown below: Purpose - The use and function of the system Information process - The process of converting data into information Participants - All people who are involved in the system Information technology - The equipment and instruction used. Data and information - Data, the input (raw material), and information, the output (processed data). The information process: - Collecting - gathering of data from real world. Eg entering details - Organising - preparing data for the use of other processes. ...read more.

Middle

All images are made of pixels, which are the smallest controllable display element on most screens. There are two types of images: Bitmapped: each pixel is treated individually and represents bits in memory. Their size, colour, tone etc is stored and therefore takes up large amount of memory. The most common bitmapped file types are BMP (high quality images), JPEG (less memory, lossy compression method) and GIF (maximum 256 colours for cartoons, lossless compression by less colour and smaller size). Vector: end points containing information about the line (thickness, colour, gradient etc) common type of file is PNG, but not supported by early versions of internet explorer. Audio - Series of sound measurements. Digital samples are created from real sound waves. The higher frequency of taking samples and the more accurate they are, the better the quality, but the larger the file. Common file types are MIDI and waveform (MP3, MP4 etc). Video - A series of still images recorded at high speed, usually along with audio. Hugh in file size. Common file types include animated GIF, MPEG, Flash etc. data is organized using key frames, one for each image that forms a video/animation when played Analyzing: An example of analyzing data is creating a chart in a spread sheet. ...read more.

Conclusion

There are three ways of converting to the new system: - Direct conversion - where the new system is completely replacing the old system. Does not allow time to check that the new one works correctly, old system is erased. - Parallel conversion - the new system and old system is run at the same time to allow room for error. - Phrased conversion - gradual implementation of new system. Certain new ones are implemented while other old ones are still operation. Each operation is individually tested. - Pilot conversion - when a small part of the organization uses the new system. If new system fails, old is there to back it up. Training is needed to teach participants to use the new system. The participants include those who are learning and those who are teaching. Who needs to be trained is decided upon their existing knowledge. Testing, evaluating and maintaining System needs to be tested to ensure that it runs correctly. Results are compared to expectations and initial aims. Determines if change is required. Occurs after minor adjustments. Evaluation is the ongoing process of assessing the system to identify areas of weakness that needs to be changed. Maintaining is the modifying of system after installation, upgrading by making minor improvements. IPT year11 exams study notes ...read more.

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