Cognitive Load
Argues that psychological safety and cognitive load act on each other: safety helps lower load by making it possible to ask for help and to worry less about interpersonal risk, while high load leaves less capacity for the quick calculation of whether speaking up is safe and worth it, so people are more likely to default to silence. The frame is Sweller's Cognitive Load Theory (1988), on the small capacity of working memory, and a three-part model Tom adapted from Fraser et al.'s 2018 paper on debriefing simulations. Intrinsic load is the difficulty built into the task, depending on its complexity and on what you already know; extraneous load is whatever takes up space without helping, from badly presented information to distraction and worry; germane load is the problem-solving and learning that do the work. The aim is to protect space for germane load.
Asking for help is where psychological safety comes in. Cognitive load theory calls it the collective working memory effect: a task too complex for one person can be spread across several working memories (Kirschner et al. 2018), though coordinating costs space too, and safety keeps that cost down because asking carries no extra work of managing how you look. Even unused, knowing help is there can help reduce anxiety, which is itself extraneous load; a meta-analysis of 177 samples and more than 22,000 people links anxiety reliably to lower working memory capacity (Moran 2016). Without safety, Edmondson's tacit calculus (if I do X here, will I be hurt, embarrassed or criticised?) runs before every question, and those constant small calculations are a burden in themselves. Nor is the load shared evenly: drawing on Keltner, Gruenfeld and Anderson's approach-inhibition theory of power (2003), the piece reads people lower on the power gradient as carrying more extraneous load before the task has started.
At team level, following Skelton and Pais's Team Topologies, cognitive load is the total mental effort a team needs to understand and look after the system it is responsible for; since adding people adds load too, the piece prefers several smaller teams to one large one. A closing note sets out the theory's limits: cognitive load theory was built for instruction, with most of its evidence from classrooms and training, so applying it to teams extends it rather than reports a finding of it, and Sweller (2010) later redefined germane load as the working memory given to intrinsic load rather than a separate kind.
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