Production planning is the main aspect for a manufacturer affecting the income of a company. Correct production planning policy chosen for the right product at the right moment in the product life cycle (PLC) reduces production, storing and other related costs. This leads to such problems to be solved as defining the present PLC phase of a product and also determining the transition point – a moment of time when the PLC phase changes. The paper presents the Agent‐Based Production Planning Support system meant for supporting a production manager in his/her production planning decisions. The developed system is based on the analysis of historical demand for products and on the information about transitions between phases in life cycles of tho...