1% ============================================================================2% UQO Working Paper 31 — PRISME3% ============================================================================4\documentclass[12pt,letterpaper]{article}5\usepackage[utf8]{inputenc}6\usepackage[T1]{fontenc}7\usepackage[english]{babel}8\usepackage[letterpaper,top=1in,bottom=1in,left=1in,right=1in]{geometry}9\usepackage{mathptmx}10\usepackage{microtype}11\usepackage{setspace}12\onehalfspacing13\usepackage{amsmath,amssymb,amsthm}14\usepackage{bm}15\usepackage{booktabs}16\usepackage{tabularx}17\usepackage{multirow}18\usepackage{threeparttable}19\usepackage{longtable,array,calc}20\usepackage{siunitx}21\sisetup{input-symbols = {()}, table-format = -1.3, parse-numbers = false}22\usepackage{graphicx}23\usepackage{subcaption}24\usepackage{float}25\usepackage{tikz}26\usetikzlibrary{arrows.meta,positioning,calc,fit,backgrounds,shapes.misc}27\usepackage[dvipsnames]{xcolor}28\usepackage[colorlinks=true,linkcolor=NavyBlue,citecolor=NavyBlue,urlcolor=NavyBlue,breaklinks=true]{hyperref}29\usepackage[authoryear,round,semicolon]{natbib}30\bibliographystyle{aer}31\usepackage[font=small,labelfont=bf,labelsep=period,justification=justified,singlelinecheck=false]{caption}32\usepackage{fancyhdr}33\pagestyle{fancy}34\fancyhf{}35\renewcommand{\headrulewidth}{0pt}36\fancyfoot[C]{\thepage}37\usepackage{titlesec}38\titleformat{\section}{\large\bfseries}{\thesection.}{0.5em}{}39\titleformat{\subsection}{\normalsize\bfseries}{\thesubsection.}{0.5em}{}40\titleformat{\subsubsection}{\normalsize\itshape}{\thesubsubsection.}{0.5em}{}41\usepackage[toc,page]{appendix}42\usepackage{enumitem}43\setlist{nosep,leftmargin=*}44\usepackage{algorithm}45\usepackage{algpseudocode}46\usepackage{listings}4748\theoremstyle{plain}49\newtheorem{proposition}{Proposition}50\newtheorem{lemma}{Lemma}51\newtheorem{corollary}{Corollary}52\theoremstyle{definition}53\newtheorem{definition}{Definition}54\newtheorem{assumption}{Assumption}55\theoremstyle{remark}56\newtheorem{remark}{Remark}5758\newcommand{\R}{\mathbb{R}}59\newcommand{\E}{\mathbb{E}}60\newcommand{\Loss}{\mathcal{L}}61\newcommand{\Act}{\mathcal{A}}62\newcommand{\Stop}{\textsc{stop}}63\newcommand{\rms}{\operatorname{rms}}64\newcommand{\sg}{\operatorname{sg}}65\newcommand{\prisme}{\textsc{prisme}}66\providecommand{\tightlist}{\setlength{\itemsep}{0pt}\setlength{\parskip}{0pt}}6768% Numbers generated by scripts (never typed by hand): results/tables/numbers.tex69\input{tables/numbers}7071% ============================================================================72\newcommand{\WPnumber}{31}73\newcommand{\WPtitle}{PRISME: Intervention-Supervised Sparse Workspace Editing for Small Language Models}74\newcommand{\WPsubtitle}{Design, controlled evaluation, and negative and positive evidence at the 100M-parameter scale}75\newcommand{\WPdate}{October 2026}76\newcommand{\WPversion}{1.0}77\newcommand{\WPabstract}{\input{sections/abstract}}78\newcommand{\WPkeywords}{small language models; adaptive computation; latent workspace; counterfactual supervision; sparse routing; quality--compute frontier; reproducibility}79\newcommand{\WPjel}{C45, C63, C88}80\newcommand{\WPauthor}{Simon-Pierre Boucher}81\newcommand{\WPaffiliation}{Département des sciences administratives\\Université du Québec en Outaouais}82\newcommand{\WPemail}{simon-pierre.boucher@uqo.ca}83\newcommand{\WPaddress}{Gatineau -- Pavillon Alexandre-Taché\\283, boulevard Alexandre-Taché\\Gatineau, Québec, Canada J9A 1L8}8485\begin{document}86\input{sections/titlepage}87\input{sections/introduction}88\input{sections/related}89\input{sections/problem}90\input{sections/architecture}91\input{sections/policy}92\input{sections/learning}93\input{sections/theory}94\input{sections/implementation}95\input{sections/design}96\input{sections/results}97\input{sections/mechanistic}98\input{sections/limitations}99\input{sections/conclusion}100\input{sections/reproducibility}101\newpage102\bibliography{references}103\input{appendix/appendix}104\end{document}105