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Project-Based Assessment is one form of assessment that must be carried out by the teacher. However, Middle School Mathematics Teachers in Nganjuk Regency still have difficulty in constructing this assessment instruments. This article aims to describe the implementation of the Workshop on the Preparation of Project-Based Assessment for Middle School Mathematics Teachers in Nganjuk Regency and the responses given by the participants. Activities are carried out starting from situation analysis, partner problem analysis, solution offering, planning, implementation, and evaluation. From the questionnaire given to the participants, the results of the questionnaire score with a very good category for participant responses to the material, presenters, and duration of implementation. The average score obtained related to the material on a rating scale of 1-4, among others: the suitability of the material in meeting the needs of the teacher (3.83), the systematicity of the material (3.68), the ease of the material to be applied (3.35). Meanwhile, the average score of participants' responses to the presenter on a rating scale of 1-5 includes: mastery of the material by the presenter (4.79), clarity of presentation of material by the presenter (4.69), and clarity of answering questions (4.54). While the average score for the duration of the workshop is 3.49 on a scale of 1-4. Of the 21 groups of participants who submit the project-based assessments, 8 groups construct the assessment for grade 7, 9 groups for grade 8, and 4 groups for grade 9. While the subject matter distribution of those 21 assessments consists of: numbers made by 1 group, geometry and measurement made by 9 groups, algebra made by 8 groups, and statistics and probability made by 3 groups. All participants stated that this workshop was good and smooth, interesting, very useful, challenging, fun, satisfying, adding knowledge. A total of 96.4% of the 84 participants were passionate about practicing project-based assessment in their classrooms.

Project-Based Assessment; middle school mathematics teachers; workshop