A process of abstraction initiates the development of a theory of applied linguistics, beginning with the distinction between technical norm and technical fact. Each applied linguistic intervention has a normative dimension and a factual interface with its users. The second step is to abstract the qualifying technical modality of these artefacts,…

Complex Dynamic Systems Theory (CDST), an instantiation in applied linguistics of complexity epistemology that transcends disciplinary boundaries, has gained much traction and momentum over the last decade, finding expressions in a fast-growing number of empirical second language developmental studies. However, the literature, while rapidly…

Against the backdrop of greater emphasis on learner centredness and growing attention to learners' voices in recent decades, concerns have been raised over researchers' dominance in shaping research scope and findings. Whether it be quantitative, qualitative, or mixed-methods research, learners' voices are mostly absent at the methodological…

The Common European Framework of Reference (CEFR) is a crucial reference framework for informing teaching, learning and assessment that has achieved worldwide prominence in language education. However, there have been concerns raised regarding the breadth of its influence across different domains and countries. Using a bibliometric approach, a…

The initial high expectations of applied linguistic work did not endure. Applied linguistics is divided between adopting either a modernist or a postmodernist approach. Despite their relevant critique of modernism, the relativism promoted by postmodernist perspectives is an inadequate response to the challenges of the field. A non-reductionist…

Researchers often make claims regarding the importance of predictor variables in multiple regression analysis by comparing standardized regression coefficients (standardized beta coefficients). This practice has been criticized as a misuse of multiple regression analysis. As a remedy, I highlight the use of dominance analysis and random forests, a…

Identifying changing patterns of stability and variability is crucial when examining second language development (SLD) from a complex dynamic systems theory (CDST) perspective (Larsen-Freeman, 2020). By studying attractor states, or recurrent patterns of stability, light can be shed on the underlying dynamics of a complex dynamic system (van Geert…

Nowadays, research in second language acquisition (SLA) is becoming increasingly interdisciplinary while many technical frontiers and research hotspots have emerged. Many studies focus on interdisciplinary topics, but few in-depth studies have been conducted on interdisciplinarity. This study examined the interdisciplinarity of SLA and the…

This paper gives an account of the impact of spaces of linguistic non-understanding and spaces of linguistic partial understanding in the first author's linguistic ethnographic doctoral study of lawyer-client communication within UK immigration legal advice meetings. The paper uses the researching multilingually framework as a lens for exploring…

Structural equation modeling (SEM), as a flexible and versatile multivariate statistical technique, has been growingly used since its introduction in the 1970s. This article presents a methodological synthesis of the characteristics of the use of SEM in L2 research by examining the reporting practices in light of the current SEM literature to…

This dissertation deals with the perception of the aspirated coda /s/ by Spanish L2 learners. Second language research, with some exceptions, focuses on whether L1English-L2 Spanish learners can perceive the aspirated variant, showing that only advanced learners with time spent in s-weakening regions succeed at the task. L2 studies about…

In this brief report, we present a scoping review of 31 second language (L2) vocabulary research syntheses published in the Web of Science from January 1990 to May 2022. The purpose of this undertaking was to understand what L2 vocabulary research synthesizers have aggregated and the investigative foci they intended to address. It was observed…

Research on Spanish heritage language (SHL) education has grown exponentially in the last two decades. The most recent nationwide study on SHL programs in US postsecondary institutions was conducted a decade ago. To continue this line of research, the primary aim of this study is to provide an update about the current state of SHL course offerings…

Peter MacIntyre's 35-years of research in SLA, psychology of language learning, and communication was systematically reviewed in six sections driven by subjective guidelines developed for the purposes of the present survey. To operationalize the objectives of the sections, an impressionistic methodology was created for analysis, according to which…

Second language development can be viewed as a complex and dynamic process in which learners follow non-linear trajectories and develop their language over a period of time (Larsen-Freeman, 2006). Intrinsic to the view of Complex Dynamic Systems Theory (CDST), a system is composed of hierarchical, interdependent subcomponents (learner, learner…