The scientific method is limited to those phenomenawhich can be observed or measured. For example, what existed priorto the Big Bang and the known universe is outside of the realm of scienceto investigate.
Krashen's widely known and well acceptedtheory of second language acquisition has had a large impact inall areas of second language research and teaching since the 1980s.
Theory | Definition of Theory by Merriam-Webster
The American Heritage Dictionary defines a as, "a tentative explanation for an observation, phenomenon, or scientific problem that can be tested by further investigation." This means a hypothesis is the stepping stone to a soon-to-be proven theory. For a hypothesis to be considered a scientific hypothesis, it must be proven through the scientific method. Like anything else in life, there are many paths to take to get to the same ending. Let's take a look at the different types of hypotheses that can be employed when seeking to prove a new theory.
Thus, it is important to define hypothesis
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.
Definition of theory in English: theory
A consequence of the logarithmicfunction is that it is the ratio of the years defining an interval oftime that we use to judge the duration of that interval, not theabsolute magnitudes of those years.
Define Theory - Power Thesaurus
Note that the even spacing of subjective ages ona logarithmic scale results in an exponential growth of the objective(clock) age, an octave representing a growth of 100% per step: Any (horizontally) adjacent pair of ages defines anoctave of life, and each octave should seem equally long.
Definition of Hypothesis - Maths Resources
The Input hypothesis is Krashen's attempt to explain how thelearner acquires a second language – how second language acquisition takes place. The Input hypothesis is only concerned with 'acquisition', not 'learning'.According to this hypothesis, the learner improves and progresses when he/she receives second language 'input' that is one step beyond his/her current stage of linguistic competence. For example, if a learner is at a stage 'i', then acquisition takes place when he/she is exposed to 'Comprehensible Input' that belongs to level 'i + 1'. We can then define 'Comprehensible Input' as the target language that the learner would not be able to produce but can still understand. It goes beyond the choice of words and involves presentation of context, explanation, rewording of unclear parts, the use of visual cues and meaning negotiation. The meaning successfully conveyed constitutes the learning experience.