diff --git a/fmmd_concept/fmmd_concept.tex b/fmmd_concept/fmmd_concept.tex
index 5488911..a6c3e97 100644
--- a/fmmd_concept/fmmd_concept.tex
+++ b/fmmd_concept/fmmd_concept.tex
@@ -272,7 +272,7 @@ to represent the results of analysis phases.
 The four methodologies in current use are discussed briefly below.
 
 \subsection { FTA }
-
+\glossary{name={FTA},description={Fault Tree Analysis}}
 This, like all top~down methodologies introduces the very serious problem
 of missing component failure modes \cite{faa}[Ch.9].
 %, or modelling at
diff --git a/introduction/introduction.tex b/introduction/introduction.tex
index 4875097..fcedbe3 100644
--- a/introduction/introduction.tex
+++ b/introduction/introduction.tex
@@ -15,7 +15,7 @@ The methodology developed was designed to cope with
 both the deterministic\footnote{Deterministic failure mode analysis traces failure mode effects} and probablistic approaches
 \footnote{Probablistic failure mode analysis tries to determine the probability of given SYSTEM failure modes, and pfrom these
 can determine an overall failure rate, in terms of probability of failure on demand, or failure in time (or Mean Time to Failure (MTTF).}.
-\glossary{name={safety critical},description={A safety critical system is one in which its failure may result in death or serious injury to humans, an environemntal catastophy or severe loss or damage}}
+\glossary{name={safety critical},description={A safety critical system is one in which its failure may result in death or serious injury to humans, an environmental catastrophe or severe loss or damage}}
 
 
 \paragraph{Safety Critical Controllers, knowledge and culture sub-disiplines}
@@ -242,7 +242,7 @@ a process of modularisation from the bottom~up.
 \end{list}
 
 \section{Safety Critical Systems}
-\glossary{name={safety critical},description={A safety critical system is one in which its failure may result in death or serious injury to humans, an environemntal catastophy or severe loss or damage}}
+\glossary{name={safety critical},description={A safety critical system is one in which its failure may result in death or serious injury to humans, an environmental catastrophe or severe loss or damage}}
 %
 %How safe is "safe"?
 %The word "safety" is too general—it really doesn't mean anything definitive. Therefore, we use terms such as safety-related and safety-critical.
diff --git a/survey/survey.tex b/survey/survey.tex
index 39d0748..219f980 100644
--- a/survey/survey.tex
+++ b/survey/survey.tex
@@ -43,6 +43,8 @@ describe briefly what a base component failure mode is and what a system level f
 
 \subsection { FTA }
 
+\glossary{name={FTA},description={Fault Tree Analysis}}
+
 %, or modelling at
 %a too high level of failure mode abstraction.
 FTA was invented for use on the minuteman nuclear defence missile