To improve outcomes for students in a high school alternative-education program, Jamel Adkins-Sharif knew he needed tap parents' knowledge and support. Doing this, he says, has required ramping up communication, repurposing parent-engagement events, and being honest about the fluid and often inconclusive nature of working with struggling learners.

The term "best practice" is commonly used to describe "what works" in a specific situation or environment. When principals face a thorny challenge, they turn to their colleagues in the principalship for ideas about which strategies, activities, and approaches have proved to be effective and efficient in addressing the issue.…