diff --git a/biblio-eigen.bib b/biblio-eigen.bib
index 58b0384..f4842be 100644
--- a/biblio-eigen.bib
+++ b/biblio-eigen.bib
@@ -130,6 +130,7 @@
 	             Wojciech Wieczorek},
 	booktitle = {ICGI 2018, Proceedings},
 	publisher = {Proceedings of Machine Learning Research},
+	volume    = {93},
 	year      = {2018}
 }
 
diff --git a/content.tex b/content.tex
index a647137..271d7f9 100644
--- a/content.tex
+++ b/content.tex
@@ -8,7 +8,7 @@
 \startfrontmatter
 \start
 \switchtobodyfont[20pt]
-\midaligned{\framed[width=12cm,align=center,offset=2cm,frame=off]{Nominal Techniques \& Testing Techniques for Automata}}
+\midaligned{\framed[width=12cm,align=center,offset=2cm,frame=off]{Nominal Techniques \& Testing Methods for Automata Learning}}
 \switchtobodyfont[12pt]
 \midaligned{Joshua Moerman}
 \midaligned{draft 16 November 2018}
diff --git a/content/introduction.tex b/content/introduction.tex
index afc8801..51614d6 100644
--- a/content/introduction.tex
+++ b/content/introduction.tex
@@ -207,7 +207,7 @@ This gave developers opportunities to solve problems before replacing the old co
 
 \stopsection
 \startsection
-  [title={Testing Techniques}]
+  [title={Testing Methods}]
 
 An important step in automata learning is equivalence checking.
 Normally, this is abstracted away and done by an oracle, but we intend to implement such an oracle ourselves for our applications.
@@ -227,6 +227,34 @@ In particular, the set of experiments is polynomial in size.
 These techniques will be discussed in detail in \in{Chapter}[chap:test-methods].
 More background and other related problems, as well as their complexity results, are well exposed in a survey of \citet[LeeY94].
 
+In the following example we model a record player as a finite state machine.
+We will not model the audible output -- that would depend not only on the device, but also the record one chooses to play.
+Instead, we the only observation we can make is seeing how fast the turntable spins.
+The device has two buttons: a start-stop button (\playstop) and a speed toggle (\spin) which chooses between $33 \frac{1}{3}$ rpm and $45$ rpm.
+When turned on, the system should start playing immediately at $33 \frac{1}{3}$ rpm -- this is useful for DJing.
+The system has four states as depicted in \in{Figure}[fig:record-player].
+
+\startplacefigure
+  [title={Behaviour of a record player modelled as a finite state machine.},
+   reference=fig:record-player]
+\hbox{\starttikzpicture[node distance=4cm, bend angle=10]
+  \node[state, initial, align=center]     (tl) {slow\\spinning};
+  \node[state, right of=tl, align=center] (tr) {fast\\spinning};
+  \node[state, below of=tl, align=center] (bl) {no\\spinning};
+  \node[state, right of=bl, align=center] (br) {no\\spinning};
+  
+  \path[->]
+  (tl) edge [bend right] node [left]  {\playstop} (bl)
+  (tl) edge [bend right] node [below] {\spin}     (tr)
+  (bl) edge [bend right] node [right] {\playstop} (tl)
+  (bl) edge [bend right] node [below] {\spin}     (br)
+  (tr) edge [bend right] node [above] {\spin}     (tl)
+  (tr) edge [bend right] node [left]  {\playstop} (br)
+  (br) edge [bend right] node [right] {\playstop} (tr)
+  (br) edge [bend right] node [above] {\spin}     (bl);
+\stoptikzpicture}
+\stopplacefigure
+
 \todo{I want to give an example (by giving a state machine) of why black box testing is hard.}
 \todo{I want to move some related work from the second chapter to here}.
 
diff --git a/environment/notation.tex b/environment/notation.tex
index fba5124..f7a91a6 100644
--- a/environment/notation.tex
+++ b/environment/notation.tex
@@ -13,6 +13,10 @@
 \define\bomb{\!\scale[height=.65em]{\symbol[fontawesome][]}} % bomb
 \define\money{\scale[height=.6em]{\symbol[fontawesome][eur]}\,} % euro sign + space
 
+\define\playstop{\scale[height=.5em]{\symbol[fontawesome][play]}\scale[height=.5em]{\symbol[fontawesome][pause]}} % play / stop symbol
+\define\spin{\scale[height=.6em]{\symbol[fontawesome][repeat]}} % spinning symbol
+%\define\spin{\kw{spd}} % spinning symbol
+
 \define[1]\Fam{\mathcal{#1}}
 \define\lang{\mathcal{L}}
 \define\autom{\mathcal{A}}