My Previous CALL experience (listening)

I took a CALL English class in my home country 2 years ago.
It was especially for listening, and it was called 'Three Round CALL system". As the name tells us, there are three rounds in the system.

In the first round, we watch a video (news, interviews, etc.) and catch what is talked in it. We first watch the whole video, and then we watch it again, with the video being cut into some parts. After that, we learn vocabulary and expressions used in it, and get general knowledge about the topic.

In the second round, we watch the video again, and catch the details of the topic. We watch it with small parts, too. After that, we review the vocabulary and expressions, and have small quiz about the topic.

In the last round, we watch the whole video and try to catch more details. Finally we have a quiz and measre how deeply we understand the video.

For many of us, this system worked effectively to improve our listening skills, and most of them liked the system.


Qestion: Can CALL be effective for all the four skills: reading, listening, writing, and speaking? (I'm wondering if CALL can be more effective than other materials, especially in reading and writing.)