Summarize two popular methods for estimating agile costs.

Agile Estimating and Planning: This method involves estimating the size of Agile projects often in story points or ideal days. The team then uses velocity, the amount of work they can complete in one iteration, to predict how much work they can do in the future. This method allows for changes and adjustments as the project progresses and more is learned about the work.

The Bucket System: This is a fast estimation method that can be used when there are many items to estimate. The items to be estimated are placed in "buckets" or groups of similar size. This method is less precise but can be used to give a rough estimate of the total size of a project or how much work can be done in a certain time period.