The impact of lean manufacturing practices on operational and business performances at SMES in the wooden furniture industry
Authors: Susanty Aries , Sumiyati Ling Sri , Syaiful Syaiful , Nihlah Zahrotun 
Published: June 2021

Purpose
First, this study aims to examine the level of implementation of lean manufacturing (LM) practices by the small- and medium-sized enterprises (SMEs) in the wooden furniture industry in Jepara. Second is to examine the impact of LM practices on operational performance (OP) and business performance (BP). Third is to examine the impact of LM practices on BP with OP as a mediating and moderating variable. OP is the quantifiable aspect of the process of an organisation, such as production cycle time, reliability and inventory turnover, whereas BP is usually related to the responsibility of the firms to their shareholders and has the goal of profit maximization.

Design/methodology/approach
This study used primary data collected through an offline questionnaire. The questionnaire was intended to identify the extent of the implementation of LM practices and the level of OP and BP achieved by SMEs. The LM practices consist of 6 dimensions with 26 indicators; OP, 4 dimensions with 11 indicators; and BP, 3 dimensions with 9 indicators. The data obtained from the questionnaire were processed via partial least squares (PLS) regression using the SmartPLS software. PLS is generally used to assess the extent to which LM practices predict values in OP and BP.

Findings
A total of 100 questionnaires were administered, of which 81% were properly filled, completed and returned. The result of the study confirms that LM practices should be applied collectively and comprehensively as each practice is interdependent. Moreover, it confirms that these practices have a direct effect on OP and BP and that OP can drive broader BP measures. Finally, the result confirms that these practices can improve BP indirectly with OP as a mediator variable. While the empirical evidence in this study supported the role of OP as a mediating variable between the implementation of LM practices and OB, it did not support the role of OP as a moderating variable.

Research limitations/implications
First, it is arguable that LM practices, OP and BP are only measured by the Likert scale, which would likely create bias and inconsistency from the owners or managers of SMEs in expressing the level of LM practices and performances achieved by the SMEs in the wooden furniture industry. Future research may help establish qualitative approaches to better measure the LM practices as well as the OP and BP through observation and probing. Second, this study was limited geographically (limited to only the SMEs in the wooden furniture industry in Jepara and did not cover all regions in Central Java as well as in Indonesia). Therefore, a wider geographical area could be considered, including the other regions in Indonesia which also produce wooden furniture.

Practical implications
This study practically contributes to the LM body of knowledge by identifying the relationships among the LM practices, OP and BP in SMEs. Understanding these relationships will help the owner or managers of SMEs make better decisions in achieving the OP and BP. The owner or managers of SMEs who implement the LM practices individually may experience disappointing performance results as these practices should be applied collectively and comprehensively.

Social implications
The LM practices may help the owners or managers of the SMEs to be competitive and achieve the optimum result.

Originality/value
This is the first known study that adopts the PLS framework to examine how OP measurement affects the relationship between the LM practices and BP in the case of the SMEs in Indonesia.