Constructivism is a philosophy as well as a psychology of education. Constructivism is about how knowledge is created. I recommend that you go to a paper developed by Erik Strommen and Bruce Lincoln and published by Columbia University to learn more about this important and useful idea. It will give you some perspective that will help you construct you own knowledge about strategic teaching and learning. Click here for the paper.
Thematic curriculum is about relating content for specific intended learning purposes.
Relevant instructional variations and different concepts of thematic curriculum abound in education literature. A classroom that incorporates thematic principles in engaged in content links. Thematic units provide an organizing structure. Thematic units engage emotions, social relationships, and complex cognitive processing through intellectual challenge. If the subject is history and you are studying the Industrial Revolution, for example, begin by finding a provocative painting about this time in history.