Assessment problems are still a major problem in the implementation of the 2013 curriculum even though they have been implemented for years. Based on several studies it is known that most teachers cannot design, develop instruments, implement, manage, report, utilize the results properly. The main difficulties experienced by teachers are formulating indicators, organizing instrument items, and making assessment instruments. Thus it is deemed necessary to develop an easy and applicable assessment instrument to help teachers make authentic assessments in learning Indonesian. The first step that must be done is to analyze the needs of teacher and student teachers. Preliminary surveys show that teachers and students need transparent and accountable assessment instrument models. The model can be used as a teacher's reference in conducting assessments. This model is expected to improve the competence of the 21st century: to think critically and solve problems, collaborate and communicate, and to enhance creativity. The characteristics of the model are concluded from the needs analysis carried out through survey, interview, and observation.