This is a very simple method and a solid basis for learning how to improvise; it’s a great one for beginner and intermediate guitarists alike as it doesn’t require a lot of in-depth theory to be able to put it into practice.
Graham Tippett (1977-) studied literature, music and languages in the UK before making a permanent move to Mexico in 2005. It was there he began to explore and research methods of improvisation on the guitar and published the '2 Position Scale System' series of instruction books in 2014, which are the fruit of that research. He is also well-known for his love of languages and music, drawing parallels between the two art forms as he continues to write and research on the subjects of language learning and improvisation. His relentless research into guitar improvisation has recently lead to the creation of the Hacking the CAGED System series of books, and Soloing Without Scales - an alternative look at how to improvise on guitar. Graham is also a graduate of the ACM (Academy of Contemporary Music) in Guildford, where he was taught by the likes of Guthrie Govan, Dave Kilminster, Eric Roche and many others.