Here is a reference to an article - Integrating Critical Thinking into Online Classes by Brent Muirhead D. Min., Ph.D.

The critical thinking discussed in this article is also an aspect of 'self-directed learning' and lifelong learning. The author's context is higher education, and many might argue that the competency based domination of VET in Australia reduces scope for teaching critical thinking.. However lifelong and self-directed learning are still OK. So here are the introduction and conclusion of a relevant article for those wanting to incorporate critical thinking into online delivery.  Follow the link to the whole article.

Introduction

The integration of critical thinking skills into the online curriculum is an essential to providing intellectually challenging and relevant learning experiences for students. The paper will offer a basic description of critical thinking and discuss how to engage students in higher order thinking skills.

Conclusion

A major adult education goal is helping students become self-directed learners who learn to monitor and improve their thinking skills. Distance educators need to integrate meaningful instructional activities into their classes that promote internalization of critical thinking skills and knowledge. It is one of the unique challenges of teaching online but it is essential to fostering classes and degree programs that prepare students for leadership roles in our society.