Value of a variety instructional strategies used in class

I feel it is extremely important to use a variety of instructional strategies. Instructional strategies can be teacher-centered or student-centered.  Teacher-centered strategies include presentations, demonstrations, lectures, etc. The teacher is the focus and the students follow along. This is valuable in introducing a new unit or a course of study as well as for other purposes. Length of time is important to consider. Using technology, such as a computer, Whiteboard, Overhead projector etc. can make this style of teaching more engaging. Using audio, video, pictures, graphs, etc can enhance the subject matter and get students more involved.
Student-centered strategies include discussions, role-playing, games, simulations, and problem-solving. Students learn by hands-on exploration. They learn by working individually or in teams as they collaborate with their peers. They develop critical thinking  and problem-solving skills as well as the ability to draw conclusions, make informed decisions, apply, create and share knowledge. They learn how to become a contributing member of a group. Technology can be used in so many ways to enhance this learning. Students can use word documents to write and easily edit their work, create graphs and charts from the data they collected. They can create videos, power points and use the Internet for research and collaborative learning by connecting with researchers and specialists or students from another  school/country. Using both strategies in the class is very powerful and rewarding.
Each classroom has a variety of learning styles. Using just one strategy does not meet all the needs of the students. Students will get bored without a variety of ways to explore learning. Using different strategies and switching them for learning different things meets the needs of all the students, keeps them motivated and excited about learning. It teaches them to think, learn and explore in different ways. They develop problem-solving and critical thinking skills which are important for the 21st century learner.