One can never prove the truth of a statistical (null) hypothesis.

Krashen's theory of second language acquisition consists of five main hypotheses:

Theories of Teaching Language to Children - KEPRO

Finding real problems for students to solve is clearly not a new concept for teachers, but they are facilitated in their task if schools have curricular models that support them. The at FIS is an excellent example of how the interdisciplinary approach can set students real and interesting problems to solve.

The implications of these models of learning for teaching methodologies are essentially as follows:

Theories of Teaching Language to Children

I will now briefly summarise research findings relating to both systematicity and variability, drawing implications for teaching methodology as I go along.

the probability of rejecting the null hypothesis when the null hypothesis is true.

Although both philosophers and psychologists have conducted extensive studies of hypothesis formation, surprisingly few have investigated this skill process in the actual classroom situation.


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The contradictions for planning curriculum are immediately evident. Having just discredited grammar study in the Acquisition-Learning Hypothesis,Krashen suddenly proposes that second language learners should follow the“natural” order of acquisition for grammatical morphemes. The teacheris first instructed to create a natural environment for the learner butthen, in trying to create a curriculum, they are instructed to base iton grammar. As described below in an analysis of the actual classroommethods presented in the Natural Approach, attempting to put these conflictingtheories into practice is very problematic.

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The Monitor HypothesisThe role of conscious learning is defined in this somewhat negativehypothesis: The only role that such “learned” competence can have is aneditor on what is produced. Output is checked and repaired, afterit has been produced, by the explicit knowledge the learner has gainedthrough grammar study. The implication is that the use of this Monitorshould be discouraged and that production should be left up to some instinctthat has been formed by “acquisition”. Using the Monitor, speechis halting since it only can check what has been produced, but Monitor-freespeech is much more instinctive and less contrived. However, he laterdescribes cases of using the Monitor efficiently (p.

Teaching Hypothesis/Theory/Law distinctions? : ScienceTeachers

Results from the above investigations indicate that: (1) film loops could be used to elicit hypotheses, (2) no scale for measuring the quality of hypotheses was available, and (3) much more extensive research

Teaching hypothesis formation, Science Education | …

The Natural Order hypothesis is based on research findings (Dulay & Burt, 1974; Fathman, 1975; Makino, 1980 cited in Krashen, 1987) which suggested that the acquisition of grammatical structures follows a 'natural order' which is predictable. For a given language, some grammatical structures tend to be acquired early while others late. This order seemed to be independent of the learners' age, L1 background, conditions of exposure, and although the agreement between individual acquirers was not always 100% in the studies, there were statistically significant similarities that reinforced the existence of a Natural Order of language acquisition. Krashen however points out that the implication of the natural order hypothesis is not that a language program syllabus should be based on the order found in the studies. In fact, he rejects grammatical sequencing when the goal is language acquisition.