Drawing on the later philosophies of Wittgenstein and Foucault, I offer an immanent critique of Ontario's Teacher Performance Appraisal system (TPA), as conducted in York Region District School Board (YRDSB) where I teach. The critique shows how educators unnecessarily become entangled in its reductive, criteriological rules and, how ranges of reasonable alternatives can be negotiated within or beyond these norms. Inquiry opens onto Wittgenstein and Foucault's postmodern critique of judgment, in that the investigation aims to show the background upon which teachers are judged to be 'adequate' as agreement in forms of life and governance within games of truth. As a dividing and disciplinary practice, regimes of inspection are presented as an apparatus of teacher training and normalization within the local games and politics of truth. TPA becomes a lens on teacher normalization, showing teacher subjects as they are multiply cast into a concatenation of reform initiatives, and how these castings relate to teachers' prior thrownness in forms of life, games of truth and the contingent historical a priori.An historical ontology of TPA is conducted in order to reveal how pedagogic truth and normality become present in the governance system of YRDSB, describing ways in which this particular education system conducts professional development in mandated forms of pedagogic knowledge, its powers relations that sustain them, and its arts of self constitution that inscribe and enforce them. As a system that generates reflection upon itself, YRDSB is shown to be the locus of unique problematizations of teacher responsibility and agency. It is also a site of potential contestation where practices and rhetoric from the global accountability movement are adopted and improvised into matrices of education reform, often misrepresented as "paradigm shifts." The introduction of paradigm shift rhetoric, as a coercive herding device, has the tendency to warp the power/knowledge fields of the education reforms by relativizing and then safeguarding mandated forms of pedagogic knowledge and practice from teacher critique. Expert teachers, I show, marginalized and infantilised by professional development and inspection, cope or resist by conserving their best-practices amidst a torrent of change, often feigning compliance with mandates during TPA.