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% Document Info
\author{Natalie Moore (NatalieMoore)}
\pdfinfo{
  /Title (domain-modelling.pdf)
  /Creator (Cheatography)
  /Author (Natalie Moore (NatalieMoore))
  /Subject (Domain Modelling Cheat Sheet)
}

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\noindent
\begin{multicols}{3}
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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{Domain Modelling Cheat Sheet}}}} \\
    \normalsize{by \textcolor{DarkBackground}{Natalie Moore (NatalieMoore)} via \textcolor{DarkBackground}{\uline{cheatography.com/19119/cs/3748/}}}
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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 30th May, 2015.\\
   Updated 12th May, 2016.\\
   Page {\thepage} of \pageref{LastPage}.
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  \mymulticolumn{1}{p{5.377cm}}{\bf\textcolor{white}{Sponsor}}  \\
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  \vspace{-5pt}
  %\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}{"Things" in the Problem Domain}}  \tn
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\mymulticolumn{1}{x{5.377cm}}{Problem domain = The specific area (or domain) of the users' business. Scope of the system.  \newline % Row Count 2 (+ 2)
Examples: products, sales, shippers, customers, invoices, payments \newline % Row Count 4 (+ 2)
"Things" eventually modelled.% Row Count 5 (+ 1)
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\mymulticolumn{1}{x{5.377cm}}{Called "classes" (UML) or "entities"}  \tn 
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\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Cardinality symbols ERD relationships}}  \tn
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\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{The brainstorming technique}}  \tn
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\mymulticolumn{1}{x{5.377cm}}{1. Identify a user and a set of use cases. \newline % Row Count 1 (+ 1)
2. Brainstorm with user to ID things involved \newline % Row Count 2 (+ 1)
3. Use the types of things (categories) to systematically ask questions about potential things, such as the following: Are there any tangible things you store information about? Are there any locations involved? Are there roles played by people that you need to remember? \newline % Row Count 8 (+ 6)
4. Continue to work with all types of users and stakeholders to expand the brainstorming list. \newline % Row Count 10 (+ 2)
5. Merge the results, eliminate any duplicates, and compile an initial list.% Row Count 12 (+ 2)
} \tn 
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\mymulticolumn{1}{x{5.377cm}}{Joint effort between the analyst and the users.}  \tn 
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\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Determine}}  \tn
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\mymulticolumn{1}{x{5.377cm}}{Determine entities (things in the domain)} \tn 
% Row Count 1 (+ 1)
% Row 1
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\mymulticolumn{1}{x{5.377cm}}{Attributes (of entities)} \tn 
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\mymulticolumn{1}{x{5.377cm}}{Keys (Primary, Foreign)} \tn 
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\mymulticolumn{1}{x{5.377cm}}{Data types (integer, string, etc)} \tn 
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\mymulticolumn{1}{x{5.377cm}}{Relationships (which entities are related)} \tn 
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\mymulticolumn{1}{x{5.377cm}}{Cardinality (how are entities related)} \tn 
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\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Details about Entities/Classes}}  \tn
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\mymulticolumn{1}{x{5.377cm}}{{\bf{Attribute:}} describes one piece of information about each instance of the class \newline % Row Count 2 (+ 2)
Customer has first name, last name, phone number \newline % Row Count 3 (+ 1)
{\bf{Identifier or key}}: One attribute uniquely identifies an instance of the class. Required for data entities, optional for domain classes. Customer ID identifies a customer \newline % Row Count 7 (+ 4)
{\bf{Compound attribute:}} Two or more attributes combined into one structure to simplify the model.  \newline % Row Count 9 (+ 2)
{\bf{Object:}} Class is a type of thing. Object is a specific instance of the class. Each instance has its own values for an attribute \newline % Row Count 12 (+ 3)
{\bf{Association (UML) / Relationship (ERD)}}: a naturally occurring relationship between classes (UML term). \# rep by \seqsplit{Multiplicity/Cardinality.} 1 to 1 or 1 to many.% Row Count 16 (+ 4)
} \tn 
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\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{Types of things}}  \tn
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Tangible & e.g. book, plane, car, hat, document, worksheet \tn 
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Role & Employee, Customer, doctor \tn 
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Org unit & Division, department, team \tn 
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Devices & Sensor, timer, machine, printer \tn 
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Sites / locations & Warehouse, branch, store, desk \tn 
% Row Count 11 (+ 2)
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Incident / event / interaction & Fligh, call, logon, order, payment \tn 
% Row Count 13 (+ 2)
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\begin{tabularx}{5.377cm}{X}
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\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{The Noun Technique}}  \tn
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\mymulticolumn{1}{x{5.377cm}}{1. Using the use cases, actors, and other information about the system — including inputs and outputs — identify all nouns (names). \newline % Row Count 3 (+ 3)
2. Using other information from existing systems, current procedures, and current reports or forms, add items or categories of information needed. \newline % Row Count 6 (+ 3)
3. As this list of nouns builds, you will need to refine it. Ask these questions about each noun to help you decide whether you should include it: \newline % Row Count 9 (+ 3)
- Ask questions, such as is it important and inside the scope, to see if it should be included.  \newline % Row Count 11 (+ 2)
- Ask questions to see if it really should be excluded, such as is it only a report or an input or is it an attribute.  \newline % Row Count 14 (+ 3)
- Ask questions to see if it needs further research. In other words that you cannot answer whether it needs to be included or excluded.  \newline % Row Count 17 (+ 3)
4. Create a master list of all nouns identified and then note whether each \newline % Row Count 19 (+ 2)
one should be included, excluded, or researched further. \newline % Row Count 21 (+ 2)
5. Review the list with users, stakeholders, and team members and then refine the list of things in the problem domain.% Row Count 24 (+ 3)
} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
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\mymulticolumn{1}{x{5.377cm}}{Mechanical approach to identifying classes}  \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
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% That's all folks
\end{multicols*}

\end{document}