In my experience school development plans (SDPs) are usually written by the Headteacher in September, possibly with the input of the senior leadership group. It is based on what they believe the school needs to do to improve. Some documents cover one year and others can cover several years. Some are lengthy and go on for pages, others have tried to ensure the SDP sticks to one side of A4.
Middle leaders are then told that they should write their own subject development plans around this whole school document.
Teachers then have to write their appraisal/performance management targets…
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