Tightly coupled complex systems are subject to normal accidents. Unexpected interactions (of the system parts) generate unpredicted and (in a complex system) often unnoticed effects on the performance of other parts of the system. If a complication arises, it may be too late before anybody even realizes the problem, let alone does anything about it. Nuclear power plants are a tightly coupled complex system. The Valujet flight that fell into the Florida Everglades did so because of a normal accident in oxygen canister management.
So, education is a normal accident (if we mean 'failing to meet' not just standard but a variety of other expectations beyond the testing) waiting to happen in that the whole system—from home and parents to the school house and class rooms--must meet the needs of an incredibly wide variety of students with variant levels of preparation, commitment and support.
Schools are then a normal accident waiting to happen in the way we neglect the reality of the above and choose to redefine the organizational goals as 'meeting standard' in some few test areas for all students. This narrows the work of the organization, and then creates a situation in which we miss or minimize other needs a student might have.
And, well, there's more. But I'll save the elaboration for another post.