This lecture provides an overview of methods for determining transmissibility and storage coefficients of aquifers, crucial for assessing sustainable water withdrawal. Key methods include laboratory tests, regional water-level analyses, and aquifer or pumping tests, which measure changes in water levels due to water withdrawal or addition. The lecture distinguishes between nonsteady-state and steady-state conditions, explaining how a cone of depression forms around a well during pumping and evolves over time. It details how water levels and cone shapes stabilize, influencing the interpretation of aquifer characteristics. Finally, the transition from nonsteady to steady-state conditions is influenced by factors like aquifer type and boundary effects, with confined aquifers typically reaching steady conditions faster.