Previous research or relevant research is very important in a research or scientific article. Previous research or relevant research serves to strengthen the theory and phenomenon of the relationship or influence between variables. This article reviews the factors that influence brand image and purchasing decision, namely: price perception and promotion, a Marketing Management Literature Study. The results of this research library are that: 1) Price perception has a relationship and affects the brand image; 2) Price perception has a relationship and affects purchasing decision; 3) Promotion has a relationship and affects the brand image. 4) Promotion has a relationship and affects purchasing decisions; and 5) Brand Image has a relationship and affects purchasing decisions.

Previous research or relevant research is very important in a research or scientific article. Previous research or relevant research serves to strengthen the theory and phenomena of the relationship or influence between variables. This article reviews the factors that influence employee performance, namely: job involvement through job satisfaction and organizational commitment, a study of Human Resource Management literature. The purpose of writing this article is to build a hypothesis of the influence between variables to be used in further research. The results of this literature review article are: 1) job involvement (X) has an effect on employee job satisfaction (M1); 2) work involvement (X) has an effect on organizational commitment (M2); 3) work involvement (X) affects employee performance (Y); 4) job satisfaction (M1) has an effect on employee performance (Y); 5) organizational commitment (M2) has an effect on employee performance (Y); 6) work involvement (X) through job satisfaction (M1) has an effect on employee performance (Y); and 7) work involvement (X) through organizational commitment (M2) has an effect on employee performance (Y).

The Literature Review article on the Effect of Price Perception and Service Quality on Purchase Decisions is a scientific article that aims to build a research hypothesis on the influence between variables that will be used in further research, within the scope of Marketing Management. The method of writing this Literature Review article is the library research method, which is sourced from online media such as Google Scholar, Mendeley and other academic online media. The results of this Literature Review article are that: 1) Price Perception has an effect on Purchase Decisions; and 2) Service Quality has an effect on Purchase Decisions. Apart from these 2 exogenous variables that affect the endogenous variable of Purchase Decision, there are still many other factors including Price, Product Quality and Place variables.

This article discusses literature review studies of Business Information Systems, analyzing factors that affect IT infrastructure: Software, IT Flexibility and Organizational Performance. The method of writing this article is literature study or library research. The results are that: 1) Software has a relationship and affects the IT infrastructure; 2) IT flexibility has a relationship and affects the IT infrastructure; and 3) Organizational performance has a relationship and affects the IT infrastructure.

A literature review article (literature review study) on the effects of the work environment on student motivation and performance is an academic article that aims to establish a research hypothesis about the effects of variables for further research within the framework of psychology. The writing method of this literature review article is the library search method from online media such as Google Scholar, Mendeley and other online academic media. The findings of this literature review article are: 1) learning environment affects student motivation; 2) learning environment affects student achievement; 3) student motivation affects student performance. In addition to the above exogenous variables that affect endogenous variables, there are other factors including: parent education, parent and teacher guidance.