Recently, we have witnessed a growing interest in developing teachers' language assessment literacy. The ever increasing demand for and use of assessment products and data by a more varied group of stakeholders than ever before, such as newcomers with limited assessment knowledge in the field, and the knowledge assessors need to possess (Stiggins, Phi Delta Kappa 72:534-539, 1991) directs an ongoing discussion on assessment literacy. The 1990 Standards for Teacher Competence in Educational Assessment of Students (AFT, NCME, & NEA, Educational Measurement: Issues and Practice 9:30-32, 1990) made a considerable contribution to this field of study. Following these Standards, a substantial number of for and against studies have been published on the knowledge base and skills for assessment literacy, assessment goals, the stakeholders, formative assessment and accountability contexts, and measures examining teacher assessment literacy levels. This paper elaborates on the nature of the language assessment literacy, its conceptual framework, the related studies on assessment literacy, and various components of teacher assessment literacy and their interrelationships. The discussions, which focus on what language teachers and testers need to learn, unlearn, and relearn, should develop a deep understanding of the work of teachers, teacher trainers, professional developers, stakeholders, teacher educators, and educational policymakers. Further, the outcome of the present paper can provide more venues for further research.