The personal computer has become a standard research tool and is used in the research process from data collection to publication of results. The volume of computer software increases as personal computers proliferate. Most tasks are accomplished with off-the-shelf products available at any computer store. More specific needs are usually met with commercial software packages supplied by the company providing the research equipment or from a specialized software provider. However, there are specific research needs that are best fulfilled with a custom computer program. An interface between data collection and storage that is more comfortable to the user or a model developed with a narrow scope might be better served with software developed for that application. The development of software for the MARYBLYT fire blight system is presented.