Abstract:
This research aims to studying the development of valid and reliable test instrument that can be
used to measure the physics science process skill (SPS) of mechanic wave topic for student grade XI SMA.
To know the aims has been obtained coefficient of content validity, coefficient of reliability, item difficulty
level, and item distinguishing power of the instrument. The subject of this research is student grade XI of
SMAN 2 Maros that consists of four classes as much as 87 peoples. Test instrument developed consists of 35
items in multiple choice form. Items have been validated content and validation empirically to determine the
validity of the criteria. The steps for developing SPS test instrument are: inspect the syllabus and theory,
determine the instrument dimensions and indicators, making the instrument grill, writing the test instrument
items, determine content validity, empirically validation, and assembling the items of test instrument. The
calculation result of content validity obtained internal consistency coefficient r = 0,771. Item validity of the
instrument after empirical trial obtained 27 valid items and 8 invalid items from 35 item questions that
developed. The instrument reliability coefficient obtained is ri = 0,709. The item difficulty level consist of 0%
easy items, 85,2% medium items, and 14,8% of items relatively difficult. The item distinguishing power
consist of 55,6% very good items, 18,5% good items, 14,8% marginal items, and 11,1% of items are classified
as poor.
