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Professional Issues in IT Cheat Sheet (DRAFT) by

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
can be made up of many sub-sy­stems
loosely or tightly coupled
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
“A descri­ption of something that allows it to be recorded, analysed and reorga­nised.”
Data that has been cleaned, processed, stored, organised, transm­itted…
…infor­mation that has been analysed and interp­reted
… inform­ation that has been refined by experi­ence, education, famili­arity…
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.
defined as ‘the stuff of which inform­ation is made’.
means that the data are clustered together correctly, according to the rules (syntax) that govern the chosen system, code or language being analysed.
means that the data must comply with the meanings (seman­tics) of the chosen system, code or language in question.