Sorry about the arcane reference to 'Segovia scales.' I remember them being called that during the few months of classical technique instruction I lucked into in 1965(?). If you start on any note, in C major or a sharp key scale anyway- G, D, A, E primarily- and use finger 1 on fret one, ditto through 4th finger on fret 4, open strings where available, you'll use fingers 2, 3, and 4 more or less equally. Good technique and subtly brutal muscular exercise. Index finger is the smartest one and strongest, so it will not send a letter of complaint about underuse. My particular favorite is G, which provides an easy 2 octave scale from 6th string to 1st and back, in movements that are actually useful in most accompaniments, in between chords. Hope that makes sense, Sharyn.
Carter