Further Information Needed   Because of the size and scope of this topic, there are virtually unlimited opportunities for further research such as: There are many more types of products that can be researched. It would be very beneficial for some case studies to be included as there are numerous examples of both successes and failures in the area of erosion control. A cost comparison of the different products and the long-term cost benefits would be advantageous as a tool for educating contractors on their importance