diff --git a/b.1-best-practices-in-threat-intelligence/content.tex b/b.1-best-practices-in-threat-intelligence/content.tex
index 92f9948..d581d10 100755
--- a/b.1-best-practices-in-threat-intelligence/content.tex
+++ b/b.1-best-practices-in-threat-intelligence/content.tex
@@ -51,6 +51,15 @@
 \end{itemize}
 \end{frame}
 
+\begin{frame}
+        \frametitle{Estimative Probability}
+\begin{itemize}
+        \item {\bf Words of Estimative Probability}\footnote{\url{https://www.cia.gov/library/center-for-the-study-of-intelligence/csi-publications/books-and-monographs/sherman-kent-and-the-board-of-national-estimates-collected-essays/6words.html}} proposes clear wording while estimating probability of occurence from an event.
+        \item A MISP taxonomy called {\bf estimative-language}\footnote{\url{https://www.misp-project.org/taxonomies.html}} proposes an applied model to tag information.
+\end{itemize}
+
+\end{frame}
+
 \begin{frame}
 \frametitle{Adding attributes/objects to an event}
 \begin{itemize}