This chapter aims to give an overview of relevant questions related to the measurement of first language written text quality. Referring to the relevance of standardized assessment in current educational research, various formats of measurement are introduced. Focusing on the field of writing research, the question of text quality is depicted as depending on the particular discipline and theoretical grounding. Using different text assessment studies as examples, advantages and disadvantages of numerous coding procedures (e.g. holistic, analytical, mixed models) will be discussed. Possible applications of the different methods are examined in the light of the corresponding research contexts and questions (e.g. large-scale assessment vs. individual learning support), methodical issues of measurement and cost-benefit aspects. Also, desiderata and possibilities for integrating information from formative assessment into educational settings, that is, instructional support, are considered, indicating ideas for future theory and praxis in writing research, assessment and teaching.