36 Curriculum of Junior High School of year VIII of the second semester of
English subject.
E. The reliability of the Instruments
The reliability of a research instrument is the degree of consistency and dependence with which the instrument measures the attribute. Brown
2004: 20 says that a test can be said as a reliable test if it is consistent and dependable. It means that the same test given to the same students or
matched students on two different occasions should yield similar results. In this study the researcher used SPSS version 21 computer program
with the use of the interrater to get the result of the reliability of the writing test. The two raters used a scoring rubric for the writing test, the
researcher as the first rater and the teacher of English as the second rater. According to Creswell 2008, interrater reliability involves observations
made by two or more individuals of observed behavior. The observers record their scores of the behavior and then compare the scores to see if
their scores are similar or different.
The reliability of the writing test could be seen by its reliability coefficient, in order to know the categorization of the reliability
coefficient, the researcher used the categorization based on Anderson 2003:92 offers. The value of the reliability coefficient can be seen in the
following table.
37 Table 5: The written assessment by Anderson 2003:92
Scores 4
3 2
1 Idea and
development Extensive
development of topic,
strong support of main ideas
with details Good
development of topic
Adequate development
of topic, listing of
detail Weak
development of topic
Organization Completely
organized, smooth flow
with strong sequence
Fairly well organized,
flow and sequence
evident Sparsely
organized, lack of
sequence Not organized
Vocabulary Vivid
imaginative word choice,
appropriate use of
vocabulary Good word
choice, simple words
Fair word choice, simple
words Poor or
inappropriate word choice
Sentence structure
Excellent: no errors and a
variety length Adequate:
few errors and some variety
of length Fair: choppy
with variety Poor: many
errors
Spelling Error free
Very few error 1 – 5
Some errors 6 – 10
Many errors over 10
Capitalization and
punctuation Error free
Very few error 1 – 5
Some errors 6 – 10
Many errors over 10
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