SYNERGIZING THE LAST PLANNER SYSTEM, VALUE STREAM MAPPING, AND JUST-IN-TIME APPROACHES TO ENHANCE CONSTRUCTION PROJECT PERFORMANCE IN PLATEAU STATE POLYTECHNIC, NIGERIA.

Abstract

Recurrent inefficiencies and material waste in Nigeria’s construction industry necessitate practical frameworks for improving project outcomes. This study investigates how integrating three Lean Construction tools, the Last Planner System (LPS), Value Stream Mapping (VSM), and Just-in-Time (JIT) can collectively enhance performance. Using a mixed-methods approach involving surveys, interviews, and direct observations, two pilot projects at Plateau State Polytechnic, Barkin Ladi, the Entrepreneurship Complex Phase III and the School of Environmental Studies renovation were examined. Data from 30 professionals, including architects, builders, engineers, project managers, and quantity surveyors, were analyzed using descriptive statistics and the Relative Importance Index (RII). Findings showed high awareness but moderate application of Lean tools, with JIT integration (RII = 0.673) ranking highest, followed by VSM awareness (0.633) and LPS experience (0.627). Key enablers included early project approvals, timely fund disbursement, regular site meetings, and strong supervision, all of which reduced waste and improved scheduling. The study concludes that synergizing LPS, VSM, and JIT promotes planning reliability, cost efficiency, and timely delivery. It recommends that government agencies, funding bodies such as TETFund, and professional institutions like CORBON, NSE, and NIQS integrate Lean principles into their guidelines, procurement systems, and training programs. Emphasis should be placed on practical, hands-on implementation rather than theory alone. Despite its limited sample size, the study provides a credible foundation for institutionalizing Lean Construction practices in Nigeria’s built environment.