The teacher who plans without student input will be no more successful than a bride who plans her entire life without having a groom.
So let's be honest, planning is guessing.
Now there's nothing wrong with guessing, but let's make sure that we don't make prophets of ourselves. Year plans, lesson plans, curriculums and standards typically ignore the very clients they have been made for. This is why for the longest time these tools have been labelled guides. But is it just me or have they become rules?
When and why did this happen?
The answer is elusive, but I'm convinced it has something to do with mistrust and a gross misunderstanding for real learning.
Mistrust drives manipulation. It you don't trust teachers as guides, then it's easy to justify the need for rules. Prescriptive planning tends to turn learning into linear fabrications when real learning is non-linear and constructed.
Plans need to remain as vague as possible with the understanding that they should never play more of a role prescribing the learning than the kids constructing it.