Instructional Materials in Non-Formal TVET and Higher Education Extension Programs: A Literature Review

Abstract

Higher education institutions are heavily mandated to bridge the gap between academic innovation and grassroots development through structured community-based extension programs. In the landscape of technical-vocational livelihood training such as clothing and garment technology the execution of appropriate instructional materials (IMs) plays a critical role in facilitating technical skill transmission and ensuring socio-economic empowerment. However, traditional training resources are frequently plagued by extreme technical density, outdated mechanical sewing structures, and a lack of local relevance, causing heightened anxiety and lower retention among non-formal adult learners. This study implements a rigorous Systematic Literature Review (SLR) conforming to the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) statement parameters to critically evaluate the core pedagogical configurations, structural design challenges, and evaluative methodologies surrounding instructional resources for community-based vocational sectors. By launching an explicit search protocol across databases including Scopus, Google Scholar, ERIC, and PhilJOL for literature published between 2020 and 2026, a curated matrix of peer-reviewed empirical research, national registries, and academic audits was isolated. To systematically code and extract structural insights from this literature base, a novel four-dimensional analytical framework called the C-CAE Model (Context, Competency, Andragogy, and Experience) is proposed and deployed. The thematic synthesis indicates that sustainable technical mastery relies on a comprehensive architecture: rigorous contextual diagnosis of baseline literacy, outcomes-based competency blocks prioritizing pattern drafting logic, andragogical user-interfaces utilizing icon-guided visual paths to reduce cognitive load, and structured experiential learning loops that encourage self-guided reflection and active drafting execution. Ultimately, this systematic review offers curriculum designers a definitive conceptual and systematic roadmap to build expert-validated, adult-centered training manuals.