diff --git a/ch2.tex b/ch2.tex
index 31b291a..fcfef8b 100644
--- a/ch2.tex
+++ b/ch2.tex
@@ -1,6 +1,8 @@
 \chapter{Research Perspective and Epistemological Framework}
 
-The work of others has contributed to the research perspective and the epistemological framework\footnote{In the psychological sense, rather than that of Brouwer}.
+This work is a phenomenographic study, adopting the epistemological framework of social constructivism.
+
+The work of others has contributed to both the research perspective and the epistemological framework\footnote{In the psychological sense, rather than that of Brouwer}.
 
 Marton developed the phenomenographic research perspective, which is broadly applicable to education.
 
@@ -8,6 +10,9 @@ Many researchers have contributed to the literature on educating students in the
 
 Significant work has been done on teaching computer science students about mathematical proof.
 
+By choosing this particular version of social constructivism, we inherit the situation described by Ben-Ari\cite{ben1998constructivism}:
+"The task of the teacher is significantly more difficult than in the classical paradigm, because the guidance must be based on, the understanding of each student's currently existing cognitive structures. "
+
 
 
 
diff --git a/literature.bib b/literature.bib
index aa61542..2594965 100644
--- a/literature.bib
+++ b/literature.bib
@@ -957,7 +957,8 @@ publisher={Elsevier}
   number={3-4},
   pages={327--342},
   year={1994},
-  publisher={Springer}
+  publisher={Springer},
+  annote={looks really good, is not free}
 }
 @article{selden1995unpacking,
   title={Unpacking the logic of mathematical statements},
diff --git a/thesis2.pdf b/thesis2.pdf
index f6e6a9a..c5daae5 100644
Binary files a/thesis2.pdf and b/thesis2.pdf differ