Cheatography
https://cheatography.com
Revision material for PIC module
This is a draft cheat sheet. It is a work in progress and is not finished yet.
What is a system?
a set of things working together as parts of a mechanism or an interconnecting network; an assembly of parts or components existing together in an organised way. |
a complex whole: for example, the railway system, the human body |
a set of principles or procedures according to which something is done |
generally have INPUTS, OUTPUTS, PROCESSES, BOUNDARIES |
can be made up of many sub-systems |
loosely or tightly coupled |
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outputs from one or more sub-systems can provide inputs to other systems |
What is Information?
Signs/ Signals |
An action, impulse, event, non-event that can be detected, deduced, derived |
Data |
“A description of something that allows it to be recorded, analysed and reorganised.” |
Information |
Data that has been cleaned, processed, stored, organised, transmitted… |
Knowledge |
…information that has been analysed and interpreted |
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… information that has been refined by experience, education, familiarity… |
Wisdom |
the quality of having experience, knowledge & good judgement |
σσ is an instance of information, understood as semantic content, if and only if: (GDI.1) σσ consists of one or more data; (GDI.2) the data in σσ are well-formed; (GDI.3) the well-formed data in σσ are meaningful. |
‘data’ |
defined as ‘the stuff of which information is made’. |
‘well-formed’ |
means that the data are clustered together correctly, according to the rules (syntax) that govern the chosen system, code or language being analysed. |
‘meaningful’ |
means that the data must comply with the meanings (semantics) of the chosen system, code or language in question. |
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