diff --git a/content/notes/22-performance-and-security.md b/content/notes/22-performance-and-security.md
index 886677552..2f2647a28 100644
--- a/content/notes/22-performance-and-security.md
+++ b/content/notes/22-performance-and-security.md
@@ -4,6 +4,9 @@ aliases:
 tags: 
 - info201
 - lecture
+sr-due: 2022-06-15
+sr-interval: 3
+sr-ease: 250
 ---
 
 # Performance requirements
@@ -171,3 +174,5 @@ increased security -> decreased accessiblility and usability
 	- security patches and updates
 	- preventing or mitigating known attack vectors
 
+![](https://i.imgur.com/KzYIz1b.png)
+z
\ No newline at end of file
diff --git a/content/notes/25-cost-benefit-analysis.md b/content/notes/25-cost-benefit-analysis.md
new file mode 100644
index 000000000..f9b840fb1
--- /dev/null
+++ b/content/notes/25-cost-benefit-analysis.md
@@ -0,0 +1,40 @@
+---
+title: "25-cost-benefit-analysis"
+aliases: 
+tags: 
+- info201
+- lecture
+---
+
+# justifying a project
+- of difficult to prove justification
+- three criteria
+	- need
+	- funds
+	- strong will
+
+# deciding whether to pursue a project
+- what the project address
+	- a problem
+	- opportunity
+	- directive
+- time frame
+- overall priority
+- what options do you have
+
+# Case study
+![library web system](https://i.imgur.com/KXOOiQ9.png)
+
+# Feasability analysis
+- should we build it (organisational)
+	- nature and strength of need
+	- strategic alignment? overall priority?
+	- stakeholder support? Champion?
+	- e.g., (otago uni)
+		- document management system
+		- 
+- can we bulid it (techinical)
+- will it be worth it (economic)
+- includes considerations of risk and uncertainty
+- may revisit due to uncertainty
+
diff --git a/content/notes/running-web-experiments.md b/content/notes/running-web-experiments.md
index 03842dbc9..2c8c48f3c 100644
--- a/content/notes/running-web-experiments.md
+++ b/content/notes/running-web-experiments.md
@@ -5,6 +5,9 @@ tags:
 - info203
 - scott-video
 - lecture
+sr-due: 2022-06-21
+sr-interval: 9
+sr-ease: 270
 ---
 
 randomly split traffic to website between two versions.