A working Time Agreement (WTA) is a collective agreement reached at school level between the trade union(s) and the Headteacher.
Each Local Negotiating Committee for Teachers (LNCT) will offer guidance to schools in your area on agreeing a WTA.
Once negotiations are completed, it is signed off as agreed by the Rep and Headteacher. The agreement is now binding on all staff.
All you need to know about Working Time Agreements can be found in the document below.