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\author{Natalie Moore (NatalieMoore)}
\pdfinfo{
  /Title (use-cases-defining-requirements.pdf)
  /Creator (Cheatography)
  /Author (Natalie Moore (NatalieMoore))
  /Subject (Use Cases - Defining Requirements Cheat Sheet)
}

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    \vspace{-2pt}\large{\bf{\textcolor{DarkBackground}{\textrm{Use Cases - Defining Requirements Cheat Sheet}}}} \\
    \normalsize{by \textcolor{DarkBackground}{Natalie Moore (NatalieMoore)} via \textcolor{DarkBackground}{\uline{cheatography.com/19119/cs/4231/}}}
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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 29th May, 2015.\\
   Updated 13th May, 2016.\\
   Page {\thepage} of \pageref{LastPage}.
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  Measure your website readability!\\
  www.readability-score.com
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\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Labelled use case automation boundary}}  \tn
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\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{Use Cases}}  \tn
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\mymulticolumn{2}{x{5.377cm}}{Define requirements activity} \tn 
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% Row 1
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\mymulticolumn{2}{x{5.377cm}}{Lists steps defining interactions between a role (aka UML "actor") and a system, to achieve a goal. The actor can be a human, an external system, or time.} \tn 
% Row Count 5 (+ 4)
% Row 2
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\mymulticolumn{2}{x{5.377cm}}{{\bf{Benefits}}} \tn 
% Row Count 6 (+ 1)
% Row 3
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\mymulticolumn{2}{x{5.377cm}}{Short summary of what the system will offer.} \tn 
% Row Count 7 (+ 1)
% Row 4
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\mymulticolumn{2}{x{5.377cm}}{Provides a project planning skeleton, to be used to build initial priorities, estimates, team allocation and timing.} \tn 
% Row Count 10 (+ 3)
% Row 5
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\mymulticolumn{2}{x{5.377cm}}{Provides everyone with an agreement as to what the system will/won't do.} \tn 
% Row Count 12 (+ 2)
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\mymulticolumn{2}{x{5.377cm}}{Provides context for requirements} \tn 
% Row Count 13 (+ 1)
% Row 7
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\mymulticolumn{2}{x{5.377cm}}{Helps in investigating small details which could cause big problems.} \tn 
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\mymulticolumn{2}{x{5.377cm}}{Answers often detailed / tricky / ignored business questions: "What are we supposed to do in this case?"} \tn 
% Row Count 18 (+ 3)
% Row 9
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\mymulticolumn{2}{x{5.377cm}}{Shows that the investigators have thought through every user's needs, every user system goal, every business variant involved.} \tn 
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\mymulticolumn{2}{x{5.377cm}}{{\bf{Limits}}} \tn 
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\mymulticolumn{2}{x{5.377cm}}{not good for non-interaction based requirements} \tn 
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% Row 12
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\mymulticolumn{2}{x{5.377cm}}{Clarity depends on the skill of the writer(s).} \tn 
% Row Count 24 (+ 1)
% Row 13
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\mymulticolumn{2}{x{5.377cm}}{Sometimes use cases are complex to write and to understand} \tn 
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% Row 14
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\mymulticolumn{2}{x{5.377cm}}{No fully standard definitions of use cases} \tn 
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\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Use case names}}  \tn
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\mymulticolumn{1}{x{5.377cm}}{Name a use case with a verb-noun phrase that states the actor's goal. Action, Name.% Row Count 2 (+ 2)
} \tn 
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\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{User goal technique (Use case method)}}  \tn
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\mymulticolumn{1}{x{5.377cm}}{1.	Identify all potential users for a system \newline % Row Count 1 (+ 1)
2.	(Optional) Classify users by functional role (shipping, marketing, sales) and operational level (operational, management, executive) \newline % Row Count 4 (+ 3)
3.	Interview each user and determine what goals they have when using the system \newline % Row Count 6 (+ 2)
4.	Make a preliminary list of use cases for each type of user \newline % Row Count 8 (+ 2)
5.	Look for duplicates and inconsistencies across users \newline % Row Count 10 (+ 2)
6.	Identify when multiple users need the same use case \newline % Row Count 12 (+ 2)
7.	Review completed list with users and other stakeholders for validation% Row Count 14 (+ 2)
} \tn 
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\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Event Decomposition}}  \tn
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\mymulticolumn{1}{x{5.377cm}}{This approach looks for all events that would lead to the information system being used. Each event typically leads to a use case. Simplify events to ones that have a clearly defined start and end, and achieve a clear business purpose. These are: Elementary Business Processes (EBPs) = use cases. \newline % Row Count 6 (+ 6)
Keeps attention on the macro scale purpose of the system, not internal details \newline % Row Count 8 (+ 2)
Events can be: \newline % Row Count 9 (+ 1)
- External – caused by an actor \newline % Row Count 10 (+ 1)
- Temporal – done at fixed time intervals \newline % Row Count 11 (+ 1)
- State – triggered by an internal condition, e.g. low inventory \newline % Row Count 13 (+ 2)
Steps: \newline % Row Count 14 (+ 1)
a.	Identify relevant external events \newline % Row Count 15 (+ 1)
b.	For each, name a use case \newline % Row Count 16 (+ 1)
c.	Identify relevant temporal events \newline % Row Count 17 (+ 1)
d.	For each, name a use case and define when it occurs \newline % Row Count 19 (+ 2)
e.	Identify relevant state events \newline % Row Count 20 (+ 1)
f.	For each, name a use case \newline % Row Count 21 (+ 1)
g.	Omit trivial use cases (like log in), but keep system controls% Row Count 23 (+ 2)
} \tn 
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\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Develop a use case diagram}}  \tn
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\mymulticolumn{1}{x{5.377cm}}{1. ID all stakeholders who need a use case diagram. \newline % Row Count 2 (+ 2)
2. Determine what each stakeholder or user needs to review in a use case diagram. Could be subsystem, user focused, for use cases with the includes relationship, and for use cases that are of interest to specific stakeholders. \newline % Row Count 7 (+ 5)
3. For each potential communication need select the use cases and actors to show and draw the use case diagram. \newline % Row Count 10 (+ 3)
4.Carefully name each use case diagram and then note how and when the diagram should be used to review use cases with stakeholders and users% Row Count 13 (+ 3)
} \tn 
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\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{CRUD - Create, Read or Report, Update and Delete}}  \tn
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\mymulticolumn{1}{x{5.377cm}}{1.	ID all data entities or domain classes involved  \newline % Row Count 2 (+ 2)
2.	For each verify a use case has been created that creates a new instance, updates existing instances reads or reports values of instances and deletes (archives) an instance \newline % Row Count 6 (+ 4)
3.	If a needed use case has been overlooked add a new one and ID stakeholders \newline % Row Count 8 (+ 2)
4.	With integrated apps make clear app responsible for adding and maintain data and which merely uses the data% Row Count 11 (+ 3)
} \tn 
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\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{UML - Unified Modeling Language}}  \tn
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\mymulticolumn{1}{x{5.377cm}}{1. General-purpose modeling language in the field of software engineering, which is designed to provide a standard way to visualize the design of a system. \newline % Row Count 4 (+ 4)
2. UML has been evolving since the second half of the 1990s and has its roots in the object-oriented methods developed in the late 1980s and early 1990s. \newline % Row Count 8 (+ 4)
{\bf{Why}} \newline % Row Count 9 (+ 1)
Visualise through an assortment of types of diagrams: Activities, Components and how they interact with other software, How system will run, How entities interact with others, external user interface \newline % Row Count 13 (+ 4)
{\bf{What}} \newline % Row Count 14 (+ 1)
UML diagrams include ({\emph{part of unit): Component, 	Activity}}, 	Sequence{\emph{, Class}}, Use case*, Communication% Row Count 17 (+ 3)
} \tn 
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% That's all folks
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