An 'electronic costing model 'has been developed to provide assistance to determine the cost of a basic social security benefit package in a user friendly way. It can serve as an educative tool for people with no quantitative skills allowing them to use Excel. The electronic model is based on a methodology of ILO costing studies. It can be used by policy-makers and other stakeholders to produce a first rough assessment of the feasibility of basic social security programmes in a country. But actual policy making has to be assisted with much more detailed costing and impact analysis. This user manual is meant to be a guide to help you to use the costing model. It provides detailed instructions, explanations of each of the items, and information how to find the necessary data.