diff --git a/episodes/explanation.md b/episodes/explanation.md
index 7f0e01e37..8b81749d7 100644
--- a/episodes/explanation.md
+++ b/episodes/explanation.md
@@ -28,7 +28,7 @@ it is time to begin developing teaching content to give learners the knowledge a
 they need to succeed in those assessments.
 ](./fig/cldt-step-3.svg){
 alt="An overview of the iterative process of lesson design and development,
-adapted from Nicholl's five phases,
+adapted from Nicholls' five phases,
 with step 3, 'Develop relevant content' highlighted."
 width="67%"
 }
diff --git a/episodes/formative-assessment.md b/episodes/formative-assessment.md
index 807826131..cc856caec 100644
--- a/episodes/formative-assessment.md
+++ b/episodes/formative-assessment.md
@@ -26,7 +26,7 @@ After completing this episode, participants should be able to...
 In this episode we move to the second of our iterative design process:  designing assessments to 
 measure learners' attainment of the objectives we defined previously.](./fig/cldt-step-2.svg){
 alt="An overview of the iterative process of lesson design and development, 
-adapted from Nicholl's five phases,
+adapted from Nicholls' five phases,
 with step 2, 'Design assessments for these outcomes' highlighted."
 width="67%"
 }
diff --git a/episodes/lesson-design.md b/episodes/lesson-design.md
index 3f79d42ba..bbd1115f2 100644
--- a/episodes/lesson-design.md
+++ b/episodes/lesson-design.md
@@ -22,7 +22,7 @@ After completing this episode, participants should be able to...
 
 ## A Lesson Design Process
 
-In order to design an effective lesson, we need a structured approach with the learner in mind and  clearly identified goals. Throughout this training, we will use a modified version of Nicholl's five phase paradigm for curriculum design[^1].
+In order to design an effective lesson, we need a structured approach with the learner in mind and  clearly identified goals. Throughout this training, we will use a modified version of Nicholls' five phase paradigm for curriculum design[^1].
 Nicholls' paradigm describes a process, commonly referred to as _backward design_,
 where those who wish to develop a new curriculum first begin by defining
 exactly what their learners will be able to do
@@ -66,7 +66,7 @@ to place an emphasis on assessing learning during a workshop:
 5. (After the break) evaluate how closely the outcomes meet the objectives
 
 ![An overview of the iterative process of lesson design and development 
-, adapted from Nicholl's five phases,
+, adapted from Nicholls' five phases,
 that will be presented in this training.
 ](fig/cldt-design-process.svg){
 alt="A flow diagram presenting the process of lesson design and development used in this training."
diff --git a/episodes/objectives.md b/episodes/objectives.md
index 9e24124a1..355d8a0f7 100644
--- a/episodes/objectives.md
+++ b/episodes/objectives.md
@@ -26,7 +26,7 @@ In this episode we will begin the first step of our iterative design process:
 defining the skills and knowledge we want learners to leave with.
 ](./fig/cldt-step-1.svg){
 alt="An overview of the iterative process of lesson design and development, 
-adapted from Nicholl's five phases,
+adapted from Nicholls' five phases,
 with step 1, 'Define desired learning outcomes' highlighted."
 width="67%"
 }
diff --git a/episodes/preparing.md b/episodes/preparing.md
index 225437669..90f85aff4 100644
--- a/episodes/preparing.md
+++ b/episodes/preparing.md
@@ -29,7 +29,7 @@ and gather feedback about the effectiveness of your content
 by teaching the lesson.
 ](./fig/cldt-step-4.svg){
 alt="An overview of the iterative process of lesson design and development, 
-adapted from Nicholl's five phases,
+adapted from Nicholls' five phases,
 with step 4, 'Assess learner progress' highlighted."
 width="67%"
 }
diff --git a/episodes/reflecting.md b/episodes/reflecting.md
index 12305c007..eee5b27f4 100644
--- a/episodes/reflecting.md
+++ b/episodes/reflecting.md
@@ -41,7 +41,7 @@ how you can use the notes, information, and feedback you collected when triallin
 to identify ways that the design and content could be improved.
 ](./fig/cldt-step-5.svg){
 alt="An overview of the iterative process of lesson design and development, 
-adapted from Nicholl's five phases,
+adapted from Nicholls' five phases,
 with step 5, 'Evaluate curriculum' highlighted."
 width="67%"
 }