This Simple Linear Actuarial Model (SLAM) manual is the accompanying publication to An Actuarial Model for Costing Universal Health Coverage in Armenia. It provides detailed guidelines in using the Microsoft Excel for SLAM. As an actuarial model, the SLAM calculates and presents the actuarial projections and key financial indicators to support the management of the health insurance programs nationwide and at local levels in assessing the overall costs and financial sustainability of health insurance programs. The goal is to have an actuarial model that they could update themselves without frequent intervention of actuarial experts and use for day-to-day management and assessment of alternative policy configurations of the health insurance schemes.