fixup! fixup! fixup! Add analysis

content/analysis.tex

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 %&tex
 \chapter{Analysis}
 \label{analysis}
-The goal of this chapter is to interpret the design method and crystallize it into a design plan.
-\autoref{sec:design_flow} introduces a design flow that contains the basic design steps.
-These steps are still undefined but are materialized with the techniques from the design method in \autoref{sec:design_refinement}.
-The remaining steps that are not covered by the design method are defined in \autoref{sec:design_extension}.
+The \ridm by \textcite{broenink_rapid_2019} only describes a partial design method.
+To create a complete design plan, a waterfall model is used as a basis for the design plan.
+The techniques of the \ridm are incorporated on top of the waterfall model.
+This chapter will analyse the basics of a waterfall model, and analyse what the \ridm provides.
 
-
-\section{Design Plan}
-\label{sec:design_plan}
+\section{Waterfall}
 \begin{marginfigure}
     \centering
     \includegraphics[width=2.9cm]{graphics/waterfall.pdf}
     \caption{Minimalistic implementation of waterfall model.}
     \label{fig:waterfall}
 \end{marginfigure}
-One of the requirements of the case study is to establish a design plan that can be followed during the case study.
-As \textcite{broenink_rapid_2019} do not describe a complete design method, the waterfall model \autocite{blanchard_systems_2014} is used as a basis for the design plan.
-The five different steps of the waterfall model are shown in \autoref{fig:waterfall}.
-For the structure of this thesis, the steps are split in two phases: preparation and detail design.
-The detail design phase is implemented according to the design method.
-The preparation phase is based on the approach of Systems Engineering.
-\autoref{sec:design_refinement} will discuss the design method in more detail and refine it into the design plan.
-\autoref{sec:design_extension} will implement the preparation phase.
-
-\subsection{Design Method}
-\label{sec:design_method}
-The design method describes two core components for the implementation: the rapid development cycle and the variable detail approach.
-The design method also describes the preparation steps that are required before this implementation can initiate.
-The implementation requires an initial design consisting of a list of features.
-The list of features results from dividing the functionality of the subject.
-Broenink and Broenink do not explain how this should be done, but required that each of these features should be implemented and tested individually.
-The details on how the features will be divided are covered in \autoref{sec:preparation}.
-
-The rapid development cycle consists of multiple iterations, where each iteration implements and tests one feature from the preparation.
-Which feature should be implemented first 
-%%%%%%%%%%%%%
-
-
-
-Dividing the subject 
-These features are specified by dividing the functionality of the subject 
-
-
-The rapid development cycle consists of multiple iterations, where each iteration implements and test one feature.
-
-Each iteration begins with a very low-detailed implementation of the feature.
-
-
-The design method by \textcite{broenink_rapid_2019} is organized in three core components: the preparation phase, the rapid development cycle, and the variable detail approach.
-The design method starts with the preparation phase, where the functionality of the subject is split into different features.
-The rapid development cycle consists of multiple iterations, where each iteration implements and test one feature.
-Each iteration begins with a very low-detailed implementation of the feature.
-The level of detail for this implementation is then step-wise increased till the level of detail is sufficient, such that the implementation can be realized as a prototype.
-This method of increasing detail is revered to as the variable detail approach.
-When the desired level of detail for the implementation is reached, the feature is finished and the rapid development cycle is repeated for the next feature.
-
-
-
-
-
-
-
-
-
-The core of the design method by \textcite{broenink_rapid_2019} consists of two techniques: rapid development and variable detail approach.
-The rapid development technique incorporates a cycle, that implements and test a single feature each iteration.
-The variable detail approach is part of each iteration.
-
-However, these techniques require some preparation before they can be used.
-As preparation, the functionality of the subject is split into different features that can be individually implemented and tested.
-
-
-
-The features are defined by splitting the system in such a way that 
-The implementation 
-
-A development based on the design method by \textcite{broenink_rapid_2019} implements one feature 
-The prerequisites
-
-
-
-A waterfall based design approach is used as the basis for the \emph{design flow}.
-The most basic form for a waterfall is shown in \autoref{fig:waterfall}.
-The implementation and testing steps will be 
-
-The design method by \textcite{broenink_rapid_2019} consists of three main cycles: Preparatory work, Inner Cycle, and Outer Cycle.
-These steps describe the direct 
-The aim of the preparatory work is to split and order the features and the levels of detail.
-
-\section{Refinement}
-\label{sec:design_refinement}
-
-
-\section{Extension}
-\label{sec:design_extension}
-
+One of the most basic design method for development is the waterfall model introduced by Royce
+\footnote{Interestingly, \textcite{royce_managing_1970} never called it waterfall himself, he also notes that it never worked for large software development efforts.} 
+in 1970 \autocite{blanchard_systems_2014}. 
+The simplest implementation has five steps as shown in \autoref{fig:waterfall}.
+Methods like the V-model or spiral model give significant advantage over the waterfall model, as they incorporate more evaluation and feedback, but are not as simple as the waterfall.
+This simplicity makes changing and adding design steps to the waterfall model possible.
+
+\section{Rapid Iterative Design Method}
+The \ridm by \textcite{broenink_rapid_2019} describes a methodology using two core components for the implementation: the rapid development cycle and the variable detail approach.
+The design method also describes the preparation steps that are required prior to this implementation.
+In short, the preparation prepares a list of features.
+These features are implemented one by one with in the rapid development cycle using the variable detail approach.
+This section discusses each of these three parts and how they fit in the waterfall model.
+%The list of features results from dividing the functionality of the subject.
+%Broenink and Broenink do not explain how this should be done, but required that each of these features should be implemented and tested individually.
+%The details on how the features will be divided are covered in \autoref{sec:preparation}.
+
+\subsection{Rapid Development} %kopje komt uit de lucht
+The rapid development cycle consists of multiple iterations, where each iteration implements and tests one feature, that was defined during the preparation.
+Each iteration of the rapid development incorporates the following steps:
+\begin{enumerate}
+    \item Design new feature and the corresponding tests.
+    \item Implement and test that feature.
+\end{enumerate}
+%first, second step, last->third
+The first step is to create an initial design and tests that are used to verify the requirements of the current feature.
+During the second step, the initial design will developed into a detailed design of the feature.
+This detailed design of the feature is develop with the variable detail approach, in which the level of detail is stepwise incremented.
+When the second step is completed, the implemented feature contains all the required details and passes all the tests as defined in the first step.
+From this point the rapid development cycle is repeated for the next feature, or, when no features are left, finish the development.
+
+%The rapid development cycle does not specify which feature should be implemented first, even though the order of implementation does change the feasibility of the complete development.
+%A useful example of the order of features is the development of car suspension.
+%To have a critical damped suspension in a car, the weight distribution of the car must be available.
+%Thus designing the suspension of a car before other features, that influence the weight distribution, makes it unlikely that the design is meeting the damping requirements.
+%Resulting in a feature that has to be redesigned and thus increasing the overall development cost.
+
+\subsection{Variable Detail Approach}
+The variable detail approach starts with a low-detailed model and increases the detail discretely over multiple iterations.
+The low-detailed model is for example a single transfer function of the system.
+In the following iteration, the detail of the model is increased by adding, for example, non-linearity, non-continuity or parasitic elements.
+The tests, as specified in the first step of the rapid development cycle, are performed after each addition of detail.
+If the tests show that the added detail is not conform the specifications, the added detail is reviewed or redesigned.
+When the added detail passes the tests, the process is repeated to add more detail.
+The variable detail approach is finished when all the tests are passed and all the detail is added.
+
+\subsection{Preparation}
+Although the \ridm does not specify the complete steps for the preparation, it does state some requirements.
+The rapid development cycle requires a list of features that can be implemented one by one.
+These features are gained by splitting the system into individual subsystems, where each subsystem can be implemented and tested individually.
+About the order of implementation, the \ridm states that critical features should be implemented first, as these features have an increased chance of invalidating the complete design.
+Would such a feature fail, the investment loss is limited, because the development is still in an early stage.
+
+\subsection{Combination}
+\begin{marginfigure}
+    \centering
+    \includegraphics[width=6cm]{graphics/design_flow.pdf}
+    \caption{Combined design plan, based on the \ridm and the Waterfall model.}
+    \label{fig:design_flow}
+\end{marginfigure}
+As the \ridm integrates the implementation and testing steps together, it replaces these steps in the waterfall model.
+The first three steps as seen in \autoref{fig:waterfall} are unchanged and the last two steps are replaced by the \ac{ridm}.
+A combined design flow of the both design methods is shown in \autoref{fig:design_flow}.