A slideshow recently published discusses Krashen's five main hypotheses on second language acquisition.

Here is a recapitulation of the points covered.

The Acquisition-Learning Hypothesis

Acquisition and learning are completely different.
Acquisition means you're speaking without thinking about grammar or rules.
Acquisition means you're reacting and interacting with your environment in a meaningful way: focused on the message to convey.
Acquisition comes about as a need and desire to communicate one's thoughts and feelings.
Glossika courses focus on audio acquisition and the ability to communicate one's thoughts and feelings.

The Monitor Hypothesis

This monitors how you're using the acquired language: correctly or incorrectly and relates to your knowledge of grammar.
Optimal use of the monitor focuses on easy-to-use rules and competence as a goal.
Over-use leads to the fear of making mistakes.

That language learners learn parts (morphemes) of the language in a natural order is in conflict with reality
Textbooks are normally based on what is easiest for teachers to explain, which is not the best approach for students
Native speakers use some morphemes more than others, so there is no way to predict priority
Glossika courses are built using the most frequent syntactic structures found in language allowing you to acquire a large range of expression in as little time as possible.

What a language acquirer understands is "i", meaning input.
Language acquirers should focus on comprehensible input which contains a little bit more than "i", in other words "i+1"
Language can be acquired more effectively by deducing the full meaning from context and acquiring new vocabulary
Speaking is achieved when the person understands (it's okay to delay speaking)
The more comprehensible input, the more speaking one does, the more fluent a learner becomes
Glossika courses start with the assumption that you have some "i" already, and you're looking to build upon it. Glossika is also an excellent way to recover/revive or re-learn a language you studied in school many years ago.

Low filter means: high motivation, self-confidence, good image, low anxiety
High filter means: low self-esteem, high anxiety
Low filter creates better results: stay positive and don't over-think everything!
If you have a strong reason to learn a language and are strongly motivated, then go for it! You can start a free trial right here with us.

Design dialogues that you can exchange with friends
Design interviews that you can have with anybody that you meet for the first time
Make a list of personal opinions you can share with someone
Practice role playing as someone else
Try to act out how you would solve a problem in your new language
Teach or re-tell something that you just learned or heard about in your new language

You can see the detailed slideshow regarding this presentation here: http://www.slideshare.net/AjaanRobCMU/krashens-five-main-hypotheses