This article enters the debate about the complex and dynamical nature of second language acquisition (SLA) by discussing and commenting on Pallotti's critique of Complex Dynamic Systems Theory (CDST). Pallotti's critique brings to the fore the argument that, due to its anti-reductionist stance, CDST research fails to observe three fundamental…

This article reviews several decades of the author's meta-analytic and experimental research on the conditions under which nonrandomized experiments can approximate the results from randomized experiments (REs). Several studies make clear that we can expect accurate effect estimates from the regression discontinuity design, though its statistical…

The quality of the relationships that mentors forge with their proteges is assumed to significantly affect the success of mentoring interventions. Building on previous research, this study examined the association between relationship qualities and protege functioning. Multiple reporters (e.g., mentors, proteges and teachers) were used in a…

A research project called Support Services for Flexible Delivery was commissioned by the Australian organization TAFE (technical and further education) Frontiers. Since 1995, the project has been conducted by using a research approach called the Generalizations from Case Studies (GCS) research method. The GCS method was developed, tested, and…