Computer software development, abundance and Information Technology Center (certified), software development provided by the Shenyang City HSBC and IT center. Shenyang abundance and Information Technology Center (www.4000010001.com) is specialized in the "software development, website design, development of micro-channel public number, 400 calls for the network to promote the" enterprise, the company of "honesty, hard service" concept provide you with the highest quality products and services. Welcome to inquire! Contact: Li Enze. 6 Maintenance refers to the completed development (analysis, design, coding and testing) after work and delivery of a number of software engineering software products of the activities carried out by the software. That software running under the circumstances, with appropriate modifications to the software to adapt to the new requirements, and correct errors found in running. Writing software problem reports, software modifications report. A medium-sized software development phase if it takes time for one to two years of Android software development tutorial, it is put to use in the future, it may be time to run or work for five years to ten years. Then its maintenance phase is run during the past five years to ten years. During this time, it is almost required to address the various problems encountered in the development stage, but also address some of the issues specific to the maintenance work itself. Software maintenance work to do software development, not only to remove obstacles to make the software work properly, but can also extend it to function, improve performance, in order to bring significant economic benefits. Unfortunately the app software development, software maintenance is often far less attention to the importance of software development work. In fact the software development professionals, and software development work compared to software maintenance effort and cost should be much greater. In the actual development process, software development, not from the first step to the last step, but at any stage before the next stage generally have one or more steps in the back. During the test, the problem may require design changes, users may need to make some modifications, such as requirements specification. They looked after the three programs to identify them is to do a set of such software, I began to develop the software. 4 We developed software to pay with their use, in which the use of the process where the use is inconvenient or where to meet the requirements, we would be the first first time modify these features until all the functions they require can be very perfect resolved. Development language common software development languages: JAVA, C / C ++ / php / JSP / ASP / PB / DELPHI / .NET / C # / vb / etc and the most critical need to use the database, we often say that database, common database : MySQL / SQLSERVER / ORACLE etc.