What is one of the informal measures of memory?

Span tasks are indeed considered one of the informal measures of memory. These tasks evaluate how much information a person can hold and manipulate in their mind, commonly through activities such as repeating back sequences of numbers or words in the same or reverse order. They provide insight into both working memory and processing capacity, which are fundamental components of cognitive functioning.

Such informal measures are particularly useful in educational settings because they are adaptable and can be administered in various contexts without requiring formal testing environments. They allow educators and clinicians to assess memory capabilities in a more dynamic and less intimidating way for students, offering valuable information that aids in understanding a learner's strengths and areas needing support.

In contrast, the other options are more formalized assessments or tools specifically designed to evaluate different aspects of language and cognitive functioning, rather than focusing specifically on memory through informal measurement.