This trial is conducted in the United States of America (USA). The aim of this trial is to investigate the effectiveness of biphasic insulin aspart 30 in type 2 diabetics not achieving blood sugar levels when treated with oral anti-diabetics drugs (OADs) with or without basal insulin therapy.

Inclusion Criteria:

• Type 2 diabetes mellitus for at least 12 months
• HbA1c: 7.5-10.0%
• An antidiabetic regimen that has been stable for at least 3 months
• Able and willing to perform SMBG testing as per protocol

Exclusion Criteria:

• Use of any insulin preparations other than NPH or glargine within the past 6 months
• Pregnancy, breastfeeding, intention to become pregnant within the next 12 months, or judged to be using inadequate contraceptive measures (adequate contraceptive measures includes: sterilization, intrauterine devices, oral contraceptives, or consistent use of barrier methods)
• Known or suspected allergy to trial product or agents related to trial product