A model job description for a School Business Manager is provided by NASBM http://www.nasbm.co.uk/documents/2189SBM%20Job%20Description.pdf
NASBM have also published a suite professional standards for schools business manangement professionals to set out the core and specialist areas of competence required to be successful in the role, and the content of professional development http://nasbm.co.uk/Career-Development/NASBM-Professional-Standards-Interactive.aspx