An Alternative to the Sixth Plan Model K C Majumdar Debdas Bandyopadhyay This paper presents a method for estimating plan investment, sectoral as well as aggregate, along with its different components, viz, pipeline committed investment, plan investment for capacity creation during plan and post-plan periods, using a distributive lag model of investment. The model considers adequate time structure behind the accelerator type relation between investment and capacity output and expresses the total plan investment as a function of pre as well as post-terminal rates of growth of capacity output. These rates of growth, on the other hand, can be treated as unknown solution variables in a plan model and the total plan investment can be estimated consistently with plan objectives.