OCR A Level Design Engineering Paper 1 Mark Scheme

Download the official OCR A Level Design and Technology: Design Engineering H404/01 Principles of Design Engineering mark scheme for the June 2025 examination series. This examiner-authentic OCR PDF contains complete marking guidance, worked engineering calculations, model answers, level-of-response descriptors and official OCR examiner assessment criteria for the Principles of Design Engineering paper.

The mark scheme provides detailed examiner-approved answers for engineering materials, polymers, embedded systems, electronics, ergonomic design, additive manufacturing and engineering mathematics. Students can study official OCR solutions for thermo softening polymers, thermoplastic elastomers (TPE), removable electric-toothbrush heads, rechargeable-battery power calculations, charging-system efficiency and mechanisms converting reciprocating motion into oscillating motion.

Engineering-calculation sections contain fully worked solutions for hollow-sphere geometry, PLA filament calculations for 3D printing, manufacturing-fault probability calculations, arc-length and chord-length geometry and histogram-based statistical analysis. The document additionally includes complete guidance for embedded microcontroller systems, programmable LED flowcharts, SMT pick-and-place machines and reflow soldering ovens used in PCB manufacturing.

The mark scheme explains OCR’s official level-based marking approach for extended-response questions involving ergonomic product analysis, responsible sourcing of cobalt for electric-car batteries, social and ethical manufacturing issues, environmental impacts and embedded-system product development. It also contains indicative content for sustainable manufacturing, repairability, maintenance and design-for-repair principles.

Students can use this mark scheme to understand exactly how OCR awards marks for engineering calculations, technical communication, manufacturing analysis, systems thinking and evaluative discussion. OCR additionally explains official marking principles including benefit of the doubt, follow-through marking, contradictory responses, annotation symbols and level-of-response assessment methods used during live examination marking.

This OCR H404/01 June 2025 mark scheme is essential for self-marking, engineering-calculation practice, embedded-systems revision, manufacturing-process analysis and understanding examiner expectations for high-band OCR Design Engineering responses. Perfect for students preparing for the 2026 OCR examination series, teachers designing mock assessments and tutors supporting OCR A Level Design Engineering revision. Pair it with the matching OCR H404/01 June 2025 question paper for complete examiner-guided preparation and OCR-standard assessment practice. Fully compatible with desktop, tablet and mobile PDF viewing.

This document is designed for OCR A Level Design Engineering students preparing for the 2026 examination series, especially candidates studying engineering materials, embedded systems, electronics, manufacturing and engineering mathematics. It is particularly useful for learners aiming to improve technical problem solving, engineering calculations, evaluative discussion and understanding of OCR examiner expectations.

It is also highly valuable for teachers, tutors, revision-course providers and independent learners who require official OCR marking guidance, worked solutions and assessment criteria for classroom teaching, mock examinations, embedded-systems analysis and targeted OCR Design Engineering revision.