After the pre-tests (Self-Care Activities, Self-Efficacy, Quality of Life) , the patients were given web based education and containing information and recommendations on self-management strategies for three months.

The control group didn't apply any interference during the study. Participants in the control group continued their routine follow-up.

Participants in the intervention group had unlimited access to the Web site, free of charge. The Web site was designed to run on personal computers and smartphones.

It is a 9-item information form that questions the participants' clinical measurements including height, weight, body mass index, blood pressure, and laboratory results including blood glucose, HbA1c, cholesterol, triglyceride, and microalbuminuria level.

The Diabetes Self-Care Activities Questionnaire was developed by Toobert and Glasgow to determine the self-care activities of individuals with diabetes. The Turkish validity and reliability of the questionnaire were conducted by Kav et al. (2010) and the total Cronbach alpha value was found 0.72. The tool contains 11 items, which measure the frequency of performing dia- betes self-care activities over the last seven days including diet, exercise, blood glucose testing, foot care and tobacco use. The scale total score ranges between 0-7. Higher scores indicate more self-care activities.

The Self-Efficacy Scale for Patients with Type 2 Diabetes Mellitus was developed in 1999 by Van der Bijl et al. The Turkish validity and reliability of the scale were performed by Kara et al. (2006). The total Cronbach alpha value was found to be 0.88. The scale consists of 20 items in 5-point Likert type. Responses to the scale; "Yes, I'm sure" 5 points "No, I'm not sure" are evaluated as 1 point. The scale total score ranges between 20-100. High scores according to scale total scores indicate good self-efficacy.

The Diabetes Quality of Life Scale was developed by Jacobson et al to evaluate the quality of life of individuals with diabetes (Jacobson, Groot, & Samson, 1994). The Turkish validity and reliability study of the scale was conducted by Yıldırım et al (2007). The total Cronbach alpha value of the scale was found to be 0.89. The scale total score ranges between 46-230. High scores according to scale total scores indicate good quality of life.

The Website Analysis and Measurement Inventory is a scale based on software evaluation for usability and international software standards. WAMMI is used for the evaluation of websites in many areas. The inventory includes the sub-dimensions of attractiveness, controllability, efficiency, helpfulness, learnability, global usability. The scale total score ranges between 0-100. The scores on the WAMMI are given as percentages, higher percentages indicate higher usability.