As Dr.Simon mentioned, if you failed to plan so you planning to fail. Planning phase is the most important phase of a project as every other phase of a project is dependent upon by this phase. Planning involves a lot factors before putting into practice this involves checking on a lot of things that involves availability of employees and the estimating the time required for a particular task with the available employees. As much as important, is risk management, which should always be prepared along with planning as to reduces possible setbacks later on.