SLR 18 – Thinking abstractly 116. OCR A Level (H046-H446) SRL18 – 2.1 The nature of abstraction 117. OCR A Level (H046-H446) SLR18 – 2.1 The need for abstraction 118. OCR A Level (H046-H446) SLR18 – 2.1 Abstraction & reality 119. OCR A Level (H046-H446) SLR18 – 2.1 Devise an abstract model
