diff --git a/pages/总复习2023t1.md b/pages/总复习2023t1.md
index ed74e30..57c488c 100644
--- a/pages/总复习2023t1.md
+++ b/pages/总复习2023t1.md
@@ -2237,13 +2237,26 @@
 						- **Integration**: to ensure that components
 						  and subsystems of the product **work together** as
 						  expected
-						- **Milestones**
+						- **Milestones**: Provide goals for the development team’s
+						  schedule
 						- Choose the **timing** of prototype cycles
 							- Many early models are used validate concepts
 							- Relatively few comprehensive models are necessary to test integration
 						- Plan time to **learn** from prototype cycles
 							- Avoid hardware swamp :-> where you keep building different ways out of a problem without stopping to think
 							  id:: 648ad0cb-1e77-4481-aac5-15be286baaad
+					- Strategies: #flashcard
+						- Use prototypes to reduce uncertainty
+						  Make models with a defined purpose
+						- Consider multiple forms of prototypes
+						- Choose the timing of prototype cycles
+						  l Many early models are used to validate concepts
+						  l Relatively few comprehensive models are
+						  necessary to test integration
+						  ¡ Plan time to learn from prototype cycles
+						  l Avoid the “hardware swamp” - where you keep
+						  building different ways out of a problem without
+						  stopping to think
 			- DONE Week4
 			  deck:: 2023t1/product/w4
 				- ## Topic 18 初创企业和企业家精神