Relationship that exists between the four language skills in second language learning

[lily 60]

"critically reflect on the mutual dependence /interdependence of speaking, listening, reading and writing and how this has been taken into account in the planning and delivery of English language teaching and learning"

Any idea what all these mean?

Thanks

[Plugged]

You can't pronounce if you don't listen, as you can't write if you don't read. The text asks for a reflection on the interdependence, and how it affects teaching and learning.