The Four-Year Plan (Polish: Plan Czteroletni) was a short-term national investment plan, created by Eugeniusz Kwiatkowski, deputy Prime Minister and Minister of the Treasury in the government of the Second Polish Republic. The plan, which came into existence on July 1, 1936, foresaw expansion of infrastructure, increase in the defensive abilities of Poland, preparation of foundations for the future expansion of Poland's industry, and activization of the Old-Polish Industrial Region, the oldest industrial region of the country.[1] Pawel Kosieradzki and Wladyslaw Kosieradzki co-developed the Plan with Kwiatkowski. The Polish government projected completion of the plan by June 30, 1940.[2] Its most important element was the development of the Central Industrial Region.
For the period 1940-1955, three five-year plans were prepared.[3][need quotation to verify]