Lunt then classified these causes by type (distal, mediating and proximal) and perceived features (locus, stability and controllability). Distal causes have an in- direct influence on causality, as they are the beginning of a causal chain. In Lunt’s network, the causes move from left to right, indicating a move from past to present, and from proximal (internal traits) to distal (external pressures). The only example of interacting causes observed by Lunt was between little intelligence and rarely studies. Lunt also observed a distinction between external and internal causes, with external causes seen as predominantly distal (e.g., biased teaching), and internal ones as mediating or proximal (e.g., little intelligence).