id	keyword
esutjss-148	union
esutjss-148	respondents
esutjss-148	trade
esutjss-148	effectiveness
esutjss-148	productivity
esutjss-148	system
esutjss-148	check
esutjss-148	hypothesis
esutjss-148	table
esutjss-148	management
esutjss-148	trade union
esutjss-148	research
esutjss-148	study