Bassists who wish to speak the musical language and communicate with other musicians. Bassists who prefer to see diagrams and notations of theory concepts presented in a logical way, applied specifically to electric bass. Each example is presented in almost every conceivable way, yet it is still easy to read. Bassists who want to think of music in a bassist's frame of mind and actually picture theory concepts on the neck of their instrument. Every player thinks of musical concepts using their own frame of reference.
Piano players visualize keys, guitarists see fretboards.
A true bassist can also see music on the bass. Bassists seeking a music theory reference guide intended for their instrument. It is there at a glance. Beginning bassists looking for a logical and practical way to approach and apply music theory to their instrument. Intermediate, professional, and college degreed players that need a music theory refresher.