When building a new information system, the supported data values are really building blocks. They support the system itself, and they determine what the system is capable of doing.

For people with diabetes, I believe there are three different types of information that need to be supported in a system.

1. Blood glucose readings.
2. Insulin taken.
3. Comments.

At present, I'm focused on the needs of people with type 1 diabetes, which is why I'm assuming the primary treatment is Insulin. But even with Type 1 diabetes, there are a number of other medications that may be worth tracking.

The first two choices are obvious, but I also believe it's critical to be able to represent comments as a critical piece of data.

For example, if I'm using a continuous glucose meter whose readings are affected by other medications, then I may want to enter a comment against a range of time to indicate that these readings aren't correct.

The system should be flexible and extensible to ensure that it will support future requirements, so the way in which data is represented should reflect that.