# The Impact of Information Systems Implementation in the Greek Manufacturing Enterprises
## 5 Summary, Discussion, Conclusions, and Future Research
In IS1 group, the positive impact of IS was greater in Customer service, followed by Inventory, Warehouse--the last two had same average--and Production management, while Distribution network management had the lowest average. On the other hand, in IS2 companies, the impact was more positive in Inventory management, followed by Supply and Warehouse management. Distribution network management had the lowest average slightly below 4--\"little positive\". Although it seems like IS1 companies have better results than IS2, in some cases, there is no statistically significant difference which means that the results are similar and the two groups of companies are affected similarly by the use of IS. Therefore, there is a statistically significant difference in Distribution network management, Warehouse management, Production management and Customer service, which means that in those situations the better results are the ones that made the difference for the IS1 companies which led them to better performance. There is no statistically significant difference to the Supply and Inventory management. Another comparison was held between the IS1 and IS2 companies regarding the contribution of IS implementation in certain aspects that were considered important by the authors. The IS1 companies give higher average ratings than the IS2 companies. As it was mentioned in the previous paragraph, there are cases with a statistically significant difference between the two groups and cases were there is not. A statistically significant difference occurs only in Competitive advantage and in Maintaining the Clientele between IS1 and IS2 companies. In both occasions, IS1 companies give a rating above 4 (4.32 and 4.20, respectively) while IS2 below 4 (3.92 and 3.67, respectively). It seems like IS1 companies paid more attention to improve their Competitive advantage as well as to try to maintain their customers than IS2 companies. Both companies have similar results by IS adoption in the rest (Production process, Returned products reduction, cost reduction, Relationship with the suppliers, and Faster Customer service). The two lowest average ratings for both groups are the Returned products reduction and the Relationship with the suppliers, which means that either the ISs did not help the companies to improve on those or that they paid much more attention to improve other aspects first so they did not have many resources available for those. The respondents for the IS1 companies ranked higher the Faster Customer service, Production process and Competitive advantage, while those for IS2 companies agreed on the first two, but they have as a third the Cost reduction, which was fourth for the IS1 companies. As a general conclusion, it can be said that the current research has shown that North Greek manufacturing companies use IS and they have realized that it has positive effect on their profitability. Manufacturers have also realized that IS implementation has a positive impact on the way they manage the several departments in their company. In addition, IS adoption has improved several--financial and nonfinancial--elements that help the company's strategy and performance such as competitive advantage, cost reduction, customer service, etc. In Figure 7, the authors present the total amount of the hypotheses presented into the current paper along with their validation status. At this point, the authors of this paper consider it important to acknowledge that this research was conducted under a geographical limitation since it was focused only on the manufacturing companies of North Greece and not those of the entire country. As mentioned in Section 3, the representation of the sample does not differ from the population in regards to the manufacturing sector and the district in which the company operates. Nonetheless, it would be interesting to be able to have answers from companies from the whole country.