Komba, A.Bengesi, K. M. K.Mwageni, T.2018-07-092018-07-092018978-90-5448-165-2https://www.suaire.sua.ac.tz/handle/123456789/2496This chapter aims at acquainting the planner with the concept of planning, together with the theories and models related to it. The clarification of this concept is important for understanding the state of and for implementing planning in Tanzania. The first section of this chapter is concerired with the meaning of planning, with various definitions and conceptualizations under- scored. The second section traces the evolution of planning starting from around the period before World War II to date. The third section of the chap- ter focuses on planning theories drawn from various contributors. The last section summarizes a number of planning models commonly used in devel- opment planning.enPlanning ConceptsPlanning theoriesPlanning modelsBook chapter