I’ve been trying to learn how to write a fugue (I’m in the VERY early stages). I got confused about what went where in the exposition so I made a little diagram to help me. My teacher liked it so much he asked if could use it himself, so I thought maybe other people might find it useful too.

Digram showing the anatomy of an exposition for four voices

Anatomy of an exposition (4 voices)
Voice 1: Subject, Counter Subject, free counterpoint
Voice 2: (following Voice 1’s Subject): Answer, Counter Answer, free counterpoint
Voice 3: (following Voice 2’s Answer): Subject, Counter Subject
Voice 4: (following Voice 3’s Subject): Answer