T$/$F $$In Boehm$$s spiral model$$Process is represented as a $.........$ rather than as a $............$ of activities with backtracking.$$Each loop in the spiral represents a phase in the process.T$/$F$$No fixed phases such as specification or design $-$ loops in the spiral are chosen depending on what is required.T$/$F$$Risks are not explicitly assessed and resolved throughout the process.T$/$F