This study aims to test the influence of external, internal factors and business strategy on business performance, in addition to the mediation effect of business strategy on external, internal and business performance. This research was carried out in 150 restaurants in Dili, Timor-Leste, and questionnaires were used to collect data. SMART-PLS 3.0 was used to test the hypothesis. The finding reveals that external factors had no significant impact on business performance, and internal factors positively influenced business performance. The mediation effect of external and internal factors had no significant impact on business performance. This research extends the empirical works of Huang & Lee (2012), Metts, (2007) and Barney (1991) on the relationship among external factors, internal factors, and business strategy and performance. This study practically contributes to the restaurant manager and regulators being aware of threats and opportunities from the external environment and improving internal construct to enhance business performance.

This research has three main objectives: (1) to test the impact of product and service quality, and corporate image on purchase decision, (2) to examine the effect of product and service quality on corporate image, and (3) to test  the mediating role of corporate image on  the relationship between  product and service quality, and purchase decision. The study was conducted at Timor-Telecom company in Dili, Timor-Leste, with a total of 399 participants, and SMART-PLS 3.0 was used to test the hypotheses. The findings of this study reveal that product quality, service quality, and corporate image have a positive and significant influence on purchase decision. Product and service quality also positively influence corporate image. Moreover, corporate image has a significant media ting effect on the relationship between product and service quality, and customer purchasing decision .  The results of this research suggest that companies can enhance their business performance by focusing on improving product and service quality to build apositive corporate image, which, in turn, can increase customer purchasing decisions in the dynamic changes of the telecommuni cation industry environment in Timor-Leste.