AbstractIn her article from 2019, Fleur Johns describes a change: from a style of development work marked by a propensity for ‘planning’, to one marked by a propensity for ‘prototyping’. Our project in this paper is to propose a modest shift in perspective. Where Johns traces a transition from old to new styles, we emphasise the enduring links between planning and prototyping, such that both styles are best understood through their ongoing relationships and entanglements. Returning to Pulse Lab Jakarta (PLJ), (...) the site of Johns’ initial inquiry, we offer a reinterpretation of what might be novel about PLJ for development practice. Our claim is that to understand the particular intervention that PLJ represents, and the new modes of practice it produces, it may be helpful to understand PLJ's work in the manner of a ‘modular’ attachment to existing development apparatuses, that combines big data analytics with design thinking. We then develop some reflections and speculations on the forms and novelty of PLJ in light of our redescription of its work in the language of modularity. (shrink)