2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/152199We consider families of Dirac operators on the unit interval which depend on parameters via boundary conditions. We study the associated eta forms and Maslov cocyles. With this simple example we show how previous results of Lesch/Woiciechowski and the first author on the eta invariant of cylinders generalize to the family case.24 pages, LatexDifferential Geometrytext