According to a survey conducted by Gartner Japan on in-house software development in Japan, more than 50% of respondents answered that their company's policy is to develop software in-house. The top reasons given were "reduction of development costs," "speed-up," and "utilization and accumulation of in-house know-how. In addition, more than 60% of the respondents in the same survey cited "Lack of human resources in the IT department" as a reason for preventing in-house production. We recommend the use of the business application development platform "ArielAirOne" to solve the problem of IT human resource shortage and to realize in-house production of systems. In this document, we introduce three examples of application development using ArielAirOne, tips for success, and the five features that are often cited as "reasons for choosing" ArielAirOne.