A method of evaluating glycemic control of a patient implemented on a computing device, an infusion device, an infusion device controller / programmer, or a medical device, comprising: providing a pentagon having five axes radiating from a center of the pentagon, wherein a first axis has a length representing a range of hemoglobin A 1c values, a second axis has a length representing a range of standard deviation of glucose values, a third axis has a length representing a range of amount of time per day values exceeding a first limit; a fourth axis has a length representing a range of daily area- under-curve values exceeding a second limit, and a fifth axis has a length representing a range of mean glucose values; plotting a first point on the first axis indicative of a representative hemoglobin A 1c value; plotting a second point on the second axis indicative of a representative standard deviation of glucose value; plotting a third point on the third axis indicative of a representative amount of time per day value exceeding the first limit; plotting a fourth point on the fourth axis indicative of a representative daily area-under-curve value exceeding a second limit; plotting a fifth point on the fifth axis indicative of a representative mean glucose value; plotting a sixth point on the first axis indicative of a hemoglobin A 1c value of the patient; plotting a seventh point on the second axis indicative of a standard deviation of glucose value of the patient; plotting an eighth point on the third axis indicative of an amount of time per day value exceeding the first limit of the patient; plotting a ninth point on the fourth axis indicative of a daily area-under- curve value exceeding the second limit of the patient; plotting a tenth point on the fifth axis indicative of a mean glucose value of the patient; determining a first pentagon area formed by the first point, the second point, the third point, the fourth point, and the fifth point; determining a second pentagon area formed by the sixth point, the seventh point, the eighth point, the ninth point, and the tenth point; and determining a glycemic control parameter based on the first pentagon area and the second pentagon area by dividing the second pentagon area by the first pentagon area; wherein the first axis representing the range of hemoglobin A 1c values and the fifth axis representing the range of mean glucose values are adjacent to each other in the pentagon. providing a pentagon having five axes radiating from a center of the pentagon, wherein a first axis has a length representing a range of hemoglobin A 1c values, a second axis has a length representing a range of standard deviation of glucose values, a third axis has a length representing a range of amount of time per day values exceeding a first limit; a fourth axis has a length representing a range of daily area- under-curve values exceeding a second limit, and a fifth axis has a length representing a range of mean glucose values; a first axis has a length representing a range of hemoglobin A 1c values, a second axis has a length representing a range of standard deviation of glucose values, a third axis has a length representing a range of amount of time per day values exceeding a first limit; a fourth axis has a length representing a range of daily area- under-curve values exceeding a second limit, and a fifth axis has a length representing a range of mean glucose values; plotting a first point on the first axis indicative of a representative hemoglobin A 1c value; plotting a second point on the second axis indicative of a representative standard deviation of glucose value; plotting a third point on the third axis indicative of a representative amount of time per day value exceeding the first limit; plotting a fourth point on the fourth axis indicative of a representative daily area-under-curve value exceeding a second limit; plotting a fifth point on the fifth axis indicative of a representative mean glucose value; plotting a sixth point on the first axis indicative of a hemoglobin A 1c value of the patient; plotting a seventh point on the second axis indicative of a standard deviation of glucose value of the patient; plotting an eighth point on the third axis indicative of an amount of time per day value exceeding the first limit of the patient; plotting a ninth point on the fourth axis indicative of a daily area-under- curve value exceeding the second limit of the patient; plotting a tenth point on the fifth axis indicative of a mean glucose value of the patient; determining a first pentagon area formed by the first point, the second point, the third point, the fourth point, and the fifth point; determining a second pentagon area formed by the sixth point, the seventh point, the eighth point, the ninth point, and the tenth point; and determining a glycemic control parameter based on the first pentagon area and the second pentagon area by dividing the second pentagon area by the first pentagon area; wherein the first axis representing the range of hemoglobin A 1c values and the fifth axis representing the range of mean glucose values are adjacent to each other in the pentagon.