Resource leveling optimization for multi-mode activities with generalized precedence relations

Traditional leveling optimization algorithms are confined to such simple situations as single-mode activities and start-to-finish precedence relations with zero time-lag between a pair of activities. However, they are not correspondent with the practical working mode. In this paper, according to the analysis on practical working mode, types of generalized precedence relations between a pair of activities and characteristics of multi-mode activities are studied, and constraints between a pair of activities with generalized precedence relations are established, and an leveling optimization model for multi-mode activities with generalized precedence relations is also constructed. It is proved by examples and comparative analysis that this optimization model is good in effectiveness and practicality.