Though written in sonata form, the first movement can be structurally analysed in many different ways. Sibelian scholars – Cecil Gray (1935), Gerald Abraham (1947), Simon Parmet (1955), Robert Layton (1965), and Hepokoski (1993) – have their disagreements and individual ideas as to the movement's formal divides. They debate such points as its separation into two movements, the existence of two expositions, how to functionally describe the Scherzo and Trio, and the exact location of the beginning of the recapitulation and coda.