Abstract
This study developed and validated TEDDLASS Computer Simulation (TCS) for teaching
genetics and evolution in Colleges of Education in Katsina State, Nigeria. Using Havelock's
Research, Development, and Diffusion (RD&D) model, the study involved needs assessment,
software design, Alpha (expert) validation, and Beta (field) validation. TEDDLASS covers
abstract concepts such as heredity, sex determination, linkage, mutation, and evolutionary
theories, aligned with the NCCE (2012) Biology Curriculum (BIO 323). Validation involved 27
experts and 34 field validators, and data were analyzed using mean ratings, frequency
distribution, and thematic analysis of open-ended responses. Findings revealed that TEDDLASS
was appropriate across all validation domains, including content accuracy, instructional design,
usability, and technical functionality, with 70% of content fully aligned with the curriculum.
Field validation confirmed high usability, engagement, and pedagogical relevance. The study
concludes that TEDDLASS is a valid, curriculum-aligned, and technically sound instructional
tool suitable for teaching genetics and evolution at the NCE level. It was therefore
recommended that TEDDLASS computer simulation should be adopted for teaching genetics
and evolution in Colleges of Education in Katsina State, Nigeria.
Keywords:Computer Simulation, TEDDLASS, Genetics and Evolution, RD&D model,
Instructional technology, Curriculum Validation
Publication Date: 2026-03-13