The next step is to estimate the costs of each task in your WBS, taking into account the dependencies and the resources required. You can use different methods to estimate the costs, such as analogous estimation, parametric estimation, or bottom-up estimation. Each method has its own advantages and disadvantages, so you should choose one that best fits your needs. When estimating the costs of each task, you should also consider factors like the type and quantity of resources needed, their availability and rates, the quality standards and specifications of the project, and any contingency reserves. Analogous estimation is a quick and easy way to get a rough estimate but may not account for differences in the new project. Parametric estimation uses a mathematical formula or a statistical model to estimate costs based on parameters like size, duration, or complexity. Bottom-up estimation involves estimating costs of each individual task or activity in the WBS and then adding them up for a total project cost; it is the most accurate but also the most time-consuming and labor-intensive.