In Malaysia, Lean manufacturing is a unified system that entailed with a set of philosophies, rules, guidelines, tools and techniques which imposed to eliminate significant waste in all business processes for continuous improvement. However, limited studies and publication about lean manufacturing implementation have been done in Malaysia. A single case study method was applied in this study to explore the key success factors and process of lean implementation. Primary data (interview) was collected from related field experts and the results gained was further analyzed by using Nvivo 10 software. Further discussion was made with the assistance of secondary sources. Moreover, two types of lean assessment tools, value stream mapping and gap analysis were applied to assess the current manufacturing system of the selected company for the purpose to enable to present a positive lean measurement of the selected company to support the identified objectives.