The aim of this study was to develop an active-iconic-symbolic problem-based learning model (PBM-ENIKSI) in elementary school students so that students have a strong foundation when entering higher behaviours. This type of research is village research which was developed by Plomp to have three stages, namely preliminary research, development phase or prototyping, and the assessment phase. This study produced a system model of PBM-ENIKSI consisting of 5 stages, namely 1) initial debriefing of problem solving, 2) finding solutions to problem solving through concrete objects, 3) representing problems in tables/pictures/diagrams/graphs, 4) Resolving Problems using Mathematical symbols, and 5) evaluation Problem Solving Solutions. This model will produce models in the form of books, student books and teacher manuals as a support system that can assist users in their application.