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% Document Info
\author{Natalie Moore (NatalieMoore)}
\pdfinfo{
  /Title (system-design.pdf)
  /Creator (Cheatography)
  /Author (Natalie Moore (NatalieMoore))
  /Subject (System Design Cheat Sheet)
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    {\parbox{\dimexpr\textwidth-2\fboxsep\relax}{\noindent
        \hspace*{-6pt}\includegraphics[width=5.8cm]{/web/www.cheatography.com/public/images/cheatography_logo.pdf}}
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    \vspace{-2pt}\large{\bf{\textcolor{DarkBackground}{\textrm{System Design Cheat Sheet}}}} \\
    \normalsize{by \textcolor{DarkBackground}{Natalie Moore (NatalieMoore)} via \textcolor{DarkBackground}{\uline{cheatography.com/19119/cs/2166/}}}
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  \mymulticolumn{2}{p{5.377cm}}{\bf\textcolor{white}{Cheatographer}}  \\
  \vspace{-2pt}Natalie Moore (NatalieMoore) \\
  \uline{cheatography.com/nataliemoore} \\
        \uline{\seqsplit{www}.jchmedia.com/}
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  \mymulticolumn{1}{p{5.377cm}}{\bf\textcolor{white}{Cheat Sheet}}  \\
   \vspace{-2pt}Published 31st May, 2015.\\
   Updated 12th May, 2016.\\
   Page {\thepage} of \pageref{LastPage}.
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  %\includegraphics[width=48px,height=48px]{dave.jpeg}
  Measure your website readability!\\
  www.readability-score.com
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\begin{multicols*}{3}

\begin{tabularx}{5.377cm}{X}
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\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Two Levels of Design}}  \tn
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\mymulticolumn{1}{x{5.377cm}}{{\bf{Architectural Design}} \newline % Row Count 1 (+ 1)
Broad design of the overall system structure \newline % Row Count 2 (+ 1)
Also called General Design and Conceptual Design \newline % Row Count 3 (+ 1)
{\bf{Detailed Design}} \newline % Row Count 4 (+ 1)
Low level design that includes the design of the specific program details  \newline % Row Count 6 (+ 2)
Design of each use case \newline % Row Count 7 (+ 1)
Design of the database \newline % Row Count 8 (+ 1)
Design of user and system interfaces \newline % Row Count 9 (+ 1)
Design of controls and security% Row Count 10 (+ 1)
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\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Abstract Three Layer Architecture}}  \tn
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\mymulticolumn{1}{p{5.377cm}}{\vspace{1px}\centerline{\includegraphics[width=5.1cm]{/web/www.cheatography.com/public/uploads/nataliemoore_1433044178_2015-05-31 13_48_08-Chapter6 - PowerPoint.jpg}}} \tn 
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\begin{tabularx}{5.377cm}{X}
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\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Design the system interfaces}}  \tn
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\mymulticolumn{1}{x{5.377cm}}{So other systems can talk to each other. System interfaces connect with other systems in many different ways: \newline % Row Count 3 (+ 3)
- Save data another system uses \newline % Row Count 4 (+ 1)
- Read data another system saved \newline % Row Count 5 (+ 1)
- Real time request for information \newline % Row Count 6 (+ 1)
- Software services% Row Count 7 (+ 1)
} \tn 
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\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{Components of design}}  \tn
% Row 0
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Environment & Network and deployment architecture \tn 
% Row Count 2 (+ 2)
% Row 1
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Application software & Server based apps, mobile devices, PCs. All components must itegrate as a functioning whole \tn 
% Row Count 6 (+ 4)
% Row 2
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User interface & Screens and reports o devices connected to the system \tn 
% Row Count 9 (+ 3)
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System interface & Comm interfaces between other automated systems \tn 
% Row Count 11 (+ 2)
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Database & Data structures, deployment methods. \tn 
% Row Count 13 (+ 2)
% Row 5
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Security and controls & Firewalls, Access, data protection in transit between devices. External, internal checks and measures. \tn 
% Row Count 17 (+ 4)
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\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Logical design}}  \tn
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\mymulticolumn{1}{x{5.377cm}}{abstract representation of the data flows, inputs and outputs of the system. This is often conducted via modelling. ER Modelling is commonly used.% Row Count 3 (+ 3)
} \tn 
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\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{Design Activities}}  \tn
% Row 0
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Environment & have we spc in detail environment and options in which software will execute? \tn 
% Row Count 4 (+ 4)
% Row 1
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App architecture and software & Detail spec elements of software and how each use case is executed \tn 
% Row Count 7 (+ 3)
% Row 2
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System interfaces & Spec how system will comm with all other systems inside and outside the org \tn 
% Row Count 11 (+ 4)
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User interface & Spec how users will interact with system to carry out all their tasks? (Use Cases) \tn 
% Row Count 15 (+ 4)
% Row 4
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Database & Spec in detail all info storage reqs \tn 
% Row Count 17 (+ 2)
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System controls and security & Spec elements to ensure system and data are secure and protected \tn 
% Row Count 20 (+ 3)
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\begin{tabularx}{5.377cm}{X}
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\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Design the user interfaces}}  \tn
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\mymulticolumn{1}{x{5.377cm}}{Dialog design begins with requirements, so use Use case flow of activities, etc \newline % Row Count 2 (+ 2)
Considerations: \newline % Row Count 3 (+ 1)
- Workflow \newline % Row Count 4 (+ 1)
- Dialogs \newline % Row Count 5 (+ 1)
- Form Layout \newline % Row Count 6 (+ 1)
- Look and feel \newline % Row Count 7 (+ 1)
- Multiple interfaces (s/w, web, mobile) \newline % Row Count 8 (+ 1)
- Multiple devices (laptop, touch, phone)% Row Count 9 (+ 1)
} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
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\mymulticolumn{1}{x{5.377cm}}{To the user, the interface is the system!}  \tn 
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\begin{tabularx}{5.377cm}{X}
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\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Systems Design}}  \tn
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\mymulticolumn{1}{x{5.377cm}}{Process of defining and developing systems to satisfy specified requirements of the user. \newline % Row Count 2 (+ 2)
Object-oriented analysis and design methods are becoming most widely used. \newline % Row Count 4 (+ 2)
UML standard language in object-oriented analysis and design. Widely used for modeling software systems \& increasingly used for high designing non-software systems and organizations.% Row Count 8 (+ 4)
} \tn 
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\begin{tabularx}{5.377cm}{X}
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\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Physical design}}  \tn
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\mymulticolumn{1}{x{5.377cm}}{Relates to the actual input and output processes of the system. How data is input into a system, how it is verified/authenticated, how it is processed, and how it is displayed as In Physical design, the following reqs about the system are decided: \newline % Row Count 5 (+ 5)
1. Input requirement \newline % Row Count 6 (+ 1)
2. Output requirements \newline % Row Count 7 (+ 1)
3. Storage requirements \newline % Row Count 8 (+ 1)
4. Processing Requirements \newline % Row Count 9 (+ 1)
5. System control and backup or recovery. \newline % Row Count 10 (+ 1)
Physical portion of systems design can generally be broken down into three sub-tasks: User Interface Design, Data Design, Process Design% Row Count 13 (+ 3)
} \tn 
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\begin{tabularx}{5.377cm}{X}
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\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Design the application architecture and software}}  \tn
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{1. Partition system into subsystems.  \newline % Row Count 1 (+ 1)
2. Define software architecture. Three layer or model-view-controller \newline % Row Count 3 (+ 2)
3. Detailed design of each use case: Design class diagrams, Sequence diagrams, State machine diagrams% Row Count 6 (+ 3)
} \tn 
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\begin{tabularx}{5.377cm}{X}
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\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Design Class Diagram}}  \tn
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\mymulticolumn{1}{p{5.377cm}}{\vspace{1px}\centerline{\includegraphics[width=5.1cm]{/web/www.cheatography.com/public/uploads/nataliemoore_1433044052_2015-05-31 13_46_11-Chapter6 - PowerPoint.jpg}}} \tn 
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\begin{tabularx}{5.377cm}{X}
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\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Issues when considering hosting}}  \tn
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{Reliability, security, physical facilities, staff, potential for growth% Row Count 2 (+ 2)
} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
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\begin{tabularx}{5.377cm}{X}
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\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Design the Database}}  \tn
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{Architecture: distributed or central \newline % Row Count 1 (+ 1)
Schema: Tables and columns in relational \newline % Row Count 2 (+ 1)
Referential integrity constraints: Foreign key references – for linking tables% Row Count 4 (+ 2)
} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{Uses domain model class diagram (or ERD)}  \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
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\begin{tabularx}{5.377cm}{x{2.18988 cm} x{2.78712 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{Design the security and system controls}}  \tn
% Row 0
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User interface controls & User Authorization \tn 
% Row Count 2 (+ 2)
% Row 1
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Application controls & Transactions are "atomic" \tn 
% Row Count 4 (+ 2)
% Row 2
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Database controls & No database anomalies \tn 
% Row Count 5 (+ 1)
% Row 3
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Network controls & Firewalls, access \tn 
% Row Count 6 (+ 1)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
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\begin{tabularx}{5.377cm}{X}
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\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Architectural design}}  \tn
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{The architectural design of a system emphasizes on the design of the systems architecture which describes the structure, behavior, and more views of that system and analysis.% Row Count 4 (+ 4)
} \tn 
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\begin{tabularx}{5.377cm}{X}
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\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Design models (primary)}}  \tn
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{Package diagrams \newline % Row Count 1 (+ 1)
Nodes and locations diagrams \newline % Row Count 2 (+ 1)
Design class diagrams \newline % Row Count 3 (+ 1)
Sequence Diagrams \newline % Row Count 4 (+ 1)
Database Schema \newline % Row Count 5 (+ 1)
User interface screens and reports \newline % Row Count 6 (+ 1)
System and security controls \newline % Row Count 7 (+ 1)
Communication diagrams% Row Count 8 (+ 1)
} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
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% That's all folks
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