diff --git a/content/notes/25-cost-benefit-analysis.md b/content/notes/25-cost-benefit-analysis.md
index c9bff36b8..1e86ae941 100644
--- a/content/notes/25-cost-benefit-analysis.md
+++ b/content/notes/25-cost-benefit-analysis.md
@@ -16,7 +16,7 @@ sr-ease: 270
 	- funds
 	- strong will
 
-# deciding whether to pursue a project
+## deciding whether to pursue a project
 - what the project address
 	- a problem
 	- opportunity
@@ -25,10 +25,10 @@ sr-ease: 270
 - overall priority
 - what options do you have
 
-# Case study
+## Case study
 ![library web system](https://i.imgur.com/KXOOiQ9.png)
 
-# Feasability analysis
+## Feasability analysis
 - should we build it (organisational)
 	- nature and strength of need
 	- strategic alignment? overall priority?
@@ -74,7 +74,7 @@ benefits
 	- market share
 	- improved perception of company "cool", happier staff
 
-# quantify
+## quantify
 dollar values. usually estimates/guesse
 
 e.g.,
@@ -84,7 +84,7 @@ e.g.,
 - smarter student management system with better prerequisite, modelling: how to estimate benefit
 - these are tangible benefits, intangible benefits are harder
 
-# assess economic value
+## assess economic value
 - payback period - how long until accumulated benefits equal the cost  
 - NPV: sum of costs and benefits , but future years discouted
 	- ![example](https://i.imgur.com/W6lhzKb.png)
@@ -93,7 +93,7 @@ e.g.,
 	- ![](https://i.imgur.com/puvRpYm.png)
 	- ![](https://i.imgur.com/19rMyQa.png)
 
-# Example: what is better
+## Example: what is better
 - ![](https://i.imgur.com/nxMstV5.png)
 - financial analysis isn't everything
 - possible reasons to ignore a financial analysis
@@ -102,7 +102,7 @@ e.g.,
 	- legal risk
 	- reputational risk
 
-# Comparing methods
+## Comparing methods
 - payback: ignores discounting; gives a *year*
 - NPV considers discounting, give *net benefit* in financial terms, but ignores time and amount invested
 - ROI considers discounting and amount invested, but ignored time period; gives a *percentage*
diff --git a/content/notes/review-i201.md b/content/notes/review-i201.md
index fc0ae1087..f5f2242db 100644
--- a/content/notes/review-i201.md
+++ b/content/notes/review-i201.md
@@ -95,25 +95,25 @@ tags:
 [08-business-patterns](notes/08-business-patterns.md)
 - monolithic vs client/server vs distributed (services) [Monolithic architecture](notes/software-architectures.md#Monolithic%20architecture)
 - separation of reponsilbilities [Separation of reponsibilities](notes/software-architectures.md#Separation%20of%20reponsibilities)
-- "standard patters" of design (recognise) [[s]]
-- sysstem templates 
+- "standard patters" of design (recognise) [Generic old info sys architecture](notes/software-architectures.md#Generic%20old%20info%20sys%20architecture)
+- sysstem templates [system-templates](notes/system-templates.md)
 
 # performance and security
-- performance requirements
+- performance requirements [Performance requirements](notes/22-performance-and-security.md#Performance%20requirements)
 	- how to quantify and measure
 	- response time, workload, scalability
 	- caching pooling
 	- system reliability
-- security and integrity requirements
+- security and integrity requirements [Integity and securuty controls](notes/22-performance-and-security.md#Integity%20and%20securuty%20controls)
 	- consider throughout development
 	- authentication and authorisation
 	- principle of least privilege
 
- # cost benefit analysis
- - project feasbility
+# cost benefit analysis
+ - project feasbility  [justifying a project](notes/25-cost-benefit-analysis.md#justifying%20a%20project)
 	 - need, funding, strong will
 	 - duration, priority, rick, uncertainty
 	 - should we, can we, is it worth it?
- - economic feasibility:
+ - economic feasibility: [costs and benefits](notes/25-cost-benefit-analysis.md#costs%20and%20benefits)
 	 - costs vs benefits (tangigble/intangible)
 	 - payback time (break even), NPV, ROI
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