System and method for mode switching

A method of operating a continuous glucose monitoring device, the continuous glucose monitoring device coupled to a glucose sensor and operating in an initial mode of operation, comprising:

• a. measuring a signal indicative of glucose concentration data;
• b. displaying the glucose concentration data on a user interface of the continuous glucose monitoring device, the user interface in the initial mode of operation having an initial mode of user interaction;
• c. determining data indicative of a usability of the continuous glucose monitoring device;
• d. comparing the determined data to one or more transition criteria;
• e. if the comparing indicates the determined data has met or will meet the transition criteria, causing the continuous glucose monitoring device to transition to a new mode of operation;
• and
• f. displaying the glucose concentration data on the user interface of the continuous glucose monitoring device, the user interface in the new mode of operation having a different mode of user interaction than the initial mode,
• g. such that the continuous glucose monitoring device operates in a mode of user interaction according to the device usability.