Systems thinking skills have been recognized as part of the core science literacy, and more recently, as critical 21st century skills. While several studies have investigated how games can be used to facilitate students' systems thinking skills, little is known about how teachers can design...

We consider how to optimally allocate investments in a portfolio of competing technologies using the standard mean-variance framework of portfolio theory. We assume that technologies follow the empirically observed relationship known as Wright's law, also called a "learning curve" or "experience...