1. The Problem-Based Threshold: Shifting Pre-Service Teachers' Thinking About Mathematics Instruction. Issue 1 (2nd January 2020) Authors: King, Barbara; Bartman, Jennifer; Gil, Indira Journal: Teacher educator Issue: Volume 55:Issue 1(2020) Page Start: 88 Record Type: Journal Article View Content: Available online (eLD content is only available in our Reading Rooms) ↗