Maine’s education commissioner is visiting Belfast as part of his ongoing tour to observe innovative school programs across the state. Stephen Bowen is visiting Troy Howard Middle School in Belfast on Thursday, where he will sit in on social studies, science and performing arts classes before participating in small-group conversations with teachers and eighth-graders. A film crew is accompanying the commissioner for two videos that are being produced showcasing student-centered, proficiency-based approaches in Maine schools. The Belfast visit is part of Bowen’s Promising Practices tour. He visited Biddeford Middle School earlier this week.