Effective decision making with evidence of possibility is important when faced with alternatives that are begging for attention. The alternative which proved to be most possible is given preference over the others. This paper applied the fuzzy mathematics based on Multi-Objective Decision Analysis (MODA) technique to solve the challenge of selecting a plant out of four alternatives to be considered for knowledge-based maintenance expert system development. The goal is to ensure the limited resources available is channeled towards developing the expert system for one production plant. Consequently, objectives were set and given preference ranks. Each plant was also ranked based on its performance under each objective. A fuzzy MODA technique was used to analyse the data derived from ranking of the objectives and plant. The silicate glass plant emerged as the plant that satisfied the set objectives optimally and was selected as the most preferred of the four plants.