The document discusses Fuller's model of teacher development, which proposes that teachers progress through stages focused on their concerns about themselves, tasks/situations, and impact on students. It notes that the model emphasizes personal development over professional role and prioritizes resolving technical concerns over complex pedagogical issues. However, it also suggests the model promotes reflection and understanding of oneself as a teacher if both hopes and fears are addressed. Overall, the model provides insight into how teachers develop professionally over time through addressing inward-facing concerns.