1. The problem asks which assessment tool is appropriate for measuring learners' achievement in modelling 3-D shapes using locally available materials. 2. Let's analyze each option: a. Questionnaire: Typically used to gather opinions or knowledge but not practical skills. b. Observation schedule: Involves directly observing learners performing tasks, ideal for assessing hands-on skills like 3-D modelling. c. Written test: Assesses theoretical knowledge, not practical skills. d. Role play: Useful for assessing interpersonal or communication skills, not modelling. e. Portfolio: Collection of learners' work over time, can show progress but may not capture real-time skill demonstration. 3. Since the learning outcome involves practical skill in modelling 3-D shapes, the best tool is the observation schedule, which allows the teacher to directly assess the learners' performance. Final answer: b. Observation schedule