The parts in these arrangements are designed for players from Confident/Advanced Beginner to Expert; each piece includes parts for two or three skill levels. So players can see how the parts fit together, the Conductor’s Score shows all of the parts; the Score's standard music notation makes the note and rhythm patterns easy to see.
The individual parts have a staff with standard notes and a staff with tablature that shows the rhythms.
Ukulele I usually carries the melody and the most complex rhythms if there is syncopation. Ukulele I often has more single notes than the other parts, and can expect to play higher on the fretboard than the other instruments; so, generally speaking, the Ukulele I player needs to feel comfortable above the 3rd fret.
Ukuleles II and III usually play single notes that accompany the melody; the notes and rhythms are easier than Ukulele I’s part. Occasionally these players will play chords.
Chords part. Sometimes there is a part with chords only, either strummed or plucked. Tablature and/or chord diagrams spell out the chord notes; using the belt and suspenders method, sometimes you'll see the notes of standard notation, also. Everyone in the ukulele ensemble needs to be able to change chords smoothly and in rhythm.
Baritone ukulele may play single notes—sometimes the melody—or accompaniment chords. A Bass can substitute, and for some pieces there is a separate Bass part. Occasionally, a GCEA-tuned ukulele with a low G string can substitute for a Baritone.