assessing the need for the valuation allowance, we cannot assure you that we would not need to increase the valuation allowance to cover additional deferred tax assets that may not be realizable. Any increase in the valuation allowance could have a material adverse effect on our income tax provision and net income in the period in which such determination is made. 

We had a valuation allowance of NT$182 million (US$6.0 million) on our deferred tax asset balance as of December 31, 2011. We do not have a full valuation allowance on the deferred tax asset, as we believe these benefits will be partially realizable based on our projection of future operating income. If we experience a significant decrease in our future operating income, our ability to realize the deferred tax assets could be negatively impacted, and thus an increase in the valuation allowance might be required. 

Any tax credits arising from purchases of machinery, equipment and technology, research and development expenditures, personnel training, and investments in important technology based enterprises are recognized using the flow through method. Adjustments of prior years’ tax liabilities are added to or deducted from the current year’s tax provision. Under R.O.C. GAAP, income taxes of 10% on undistributed earnings are recorded in the year of stockholders approval which is the year subsequent to the year the earnings are generated. Under US GAAP, the 10% tax on unappropriated earnings is accrued during the period the earnings arise and adjusted to the extent that distributions are approved by the stockholders in the following year. 

Effective from January 1, 2007, we adopted a guidance prescribing the recognition threshold and measurement attribute for the financial statement recognition and measurement of a tax position taken or expected to be taken in a tax return under U.S. GAAP. This guidance also provides guidance on derecognition, classification, interest and penalties, disclosure and transition. The evaluation of a tax position in accordance with this guidance is a two step process. The first step is recognition, where we evaluate whether an individual tax position has a likelihood of greater than 50% of being sustained upon examination based on the technical merits of the position, including resolution of any related appeals or litigation processes. For tax positions that are currently estimated to have a less than 50% likelihood of being sustained, zero tax benefit is recorded. For tax positions that have met the recognition threshold in the first step, we perform the second step of measuring the benefit to be recorded. The actual benefits ultimately realized may differ from the estimates. The adoption of this guidance did not have a material impact on our results of operation, financial position and cash flows. We did not identify significant unrecognized tax benefits for the year ended December 31, 2009, 2010 and 2011. It is highly unlikely that we will incur any interests or penalties related to potential underpaid income tax expenses. 

## Our Financial Reporting Obligations 

Our ongoing financial reporting in our Form 20-F annual reports and interim financial reporting furnished to the SEC on Form 6-K had been based on U.S. GAAP through fiscal year 2007. Beginning with our first quarter interim financial report furnished on Form 6-K and our Form 20-F annual report for fiscal year 2008, we prepared our financial statements under R.O.C. GAAP, with reconciliations to U.S. GAAP. 

## A. Operating Results 

The following table sets forth our revenues, operating costs and expenses, income from operations and other financial data for the periods indicated. 

