Pamela Weber Harris is a former mathematics teacher who currently works as a mathematics education consultant and instructor of elementary math methods at Texas State University. Harris has also authored or co-authored several books about teaching math and appeared in a fascinating 2016 episode of Science Friday, "How Much Math Should Everyone Know? (Show Your Work)." In this 70 minute webinar, Harris demonstrates an instructional technique that she calls Problem Strings. In this method, math learners solve a series of problems collaboratively and use information and techniques from previous problems to help them solve new problems. The instructor, meanwhile, can use these problem strings to model new mathematical concepts and problem solving techniques. As Harris demonstrates, this teaching technique can be used for a variety of levels of mathematics, making this webinar of potential interest to both K-12 mathematics teachers and adult educators.