Type 1 and Type 2 vs. Type A and Type B | ISAE 3402

Initially, the exposure draft (released in December of 2007), along with a number of white papers and executive briefs written by practitioners referenced the two ISAE 3402 reports as that being a Type A and a Type B. However, the IAASB decided that in finalizing the ISAE 3402 standard, it would be appropriate to change the terms from Type A and Type B reports to Type 1 and Type 2 reports.

However, to be consistent with the ED (Exposure Draft) ISAE 3402 that was initially released in December 2007, the phrase "Type A" and "Type B" were still used in their Basis for Conclusions: ISAE 3402, Assurance Reports on Controls at a Service Organization.

The three main reports released by the IAASB regarding ISAE 3402 are as follows:

• December 2007: ED (Exposure Draft) ISAE 3402, Assurance Reports on Controls at a Third Party Service Organization.

• December 2009: Basis for Conclusions: ISAE 3402, Assurance Reports on Controls at a Service Organization.

• December 2009: ISAE 3402, Assurance Reports on Controls at a Third Party Service Organization. (Final Draft)