The purpose of this study is to identify and evaluate the scale of implementation of Just-In-Time (JIT) in the different industrial sectors in the Middle East. This study analyzes the empirical data collected by a questionnaire survey distributed to companies in five main industrial sectors in the Middle East, which are: food, construction, chemicals, fabrics and engineering. The following two main hypotheses are formulated and tested: 1- The requirements of JIT application differ according to the type of industrial sector. 2- The elements of JIT application differ according to the type of industrial sector. Descriptive statistics and ANOVA test were used to examine the two hypotheses. This study indicates a reasonable evidence for accepting these main hypotheses. It reveals that there is no standard way to adopt JIT as a production system, where each industrial sector should concentrate in the investment on critical requirements and elements that differ according to the nature and strategy of production followed in that sector.