Which estimation technique is commonly used in SAFe to estimate the size of Features?

T-shirt sizing is an estimation technique commonly used in SAFe to provide a quick and relative understanding of the size of Features. This technique categorizes work into sizes that resemble clothing sizes, such as XS, S, M, L, and XL, which allows teams to estimate the complexity and effort involved without needing precise measurements.

The advantage of T-shirt sizing is that it facilitates discussion among cross-functional teams, encourages collaboration, and provides a straightforward way to compare different Features against each other. It helps teams make informed decisions on prioritization and resource allocation. This method works well in agile environments where rapid feedback and flexibility are critical.

Using this technique aligns well with the principles of SAFe, as it promotes the idea of relative estimation over absolute, allowing teams to assess work in a more agile manner. Other methods such as ideal days or planning poker offer valuable ways to estimate as well, but T-shirt sizing specifically focuses on the high-level sizing of Features within the context of SAFe.