<?xml version="1.0" encoding="us-ascii"?><InstanceReport xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"><Version>2.4.0.8</Version><ReportLongName>017 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)</ReportLongName><DisplayLabelColumn>true</DisplayLabelColumn><ShowElementNames>false</ShowElementNames><RoundingOption /><HasEmbeddedReports>false</HasEmbeddedReports><Columns><Column FlagID="0"><Id>1</Id><IsAbstractGroupTitle>false</IsAbstractGroupTitle><LabelSeparator>

</LabelSeparator><CurrencyCode /><FootnoteIndexer /><hasSegments>false</hasSegments><hasScenarios>false</hasScenarios><MCU><KeyName /><CurrencySymbol /><contextRef><ContextID>Context_6ME__30-Jun-2013</ContextID><EntitySchema>http://www.sec.gov/CIK</EntitySchema><EntityValue>0000752902</EntityValue><PeriodDisplayName /><PeriodType>duration</PeriodType><PeriodStartDate>2013-01-01T00:00:00</PeriodStartDate><PeriodEndDate>2013-06-30T00:00:00</PeriodEndDate><Segments /><Scenarios /></contextRef><UPS /><CurrencyCode /><OriginalCurrencyCode /></MCU><CurrencySymbol /><Labels><Label Key="CalendarSupplement" Id="0" Label="6 Months Ended" /><Label Key="Calendar" Id="1" Label="Jun. 30, 2013" /></Labels></Column></Columns><Rows><Row FlagID="0"><Id>1</Id><IsAbstractGroupTitle>true</IsAbstractGroupTitle><LabelSeparator>

</LabelSeparator><Level>1</Level><ElementName>us-gaap_AccountingPoliciesAbstract</ElementName><ElementPrefix>us-gaap_</ElementPrefix><IsBaseElement>true</IsBaseElement><BalanceType>na</BalanceType><PeriodType>duration</PeriodType><IsReportTitle>false</IsReportTitle><IsSegmentTitle>false</IsSegmentTitle><IsCalendarTitle>false</IsCalendarTitle><IsEquityPrevioslyReportedAsRow>false</IsEquityPrevioslyReportedAsRow><IsEquityAdjustmentRow>false</IsEquityAdjustmentRow><IsBeginningBalance>false</IsBeginningBalance><IsEndingBalance>false</IsEndingBalance><IsReverseSign>false</IsReverseSign><FootnoteIndexer /><Cells><Cell FlagID="0" ContextID="" UnitID=""><Id>1</Id><IsNumeric>false</IsNumeric><IsRatio>false</IsRatio><DisplayZeroAsNone>false</DisplayZeroAsNone><NumericAmount>0</NumericAmount><RoundedNumericAmount>0</RoundedNumericAmount><NonNumbericText /><FootnoteIndexer /><CurrencyCode /><CurrencySymbol /><IsIndependantCurrency>false</IsIndependantCurrency><ShowCurrencySymbol>false</ShowCurrencySymbol><DisplayDateInUSFormat>false</DisplayDateInUSFormat></Cell></Cells><ElementDataType>xbrli:stringItemType</ElementDataType><SimpleDataType>string</SimpleDataType><IsTotalLabel>false</IsTotalLabel><UnitID>0</UnitID><Label>Accounting Policies [Abstract]</Label></Row><Row FlagID="0"><Id>2</Id><IsAbstractGroupTitle>false</IsAbstractGroupTitle><LabelSeparator>

</LabelSeparator><Level>2</Level><ElementName>us-gaap_FairValueMeasurementPolicyPolicyTextBlock</ElementName><ElementPrefix>us-gaap_</ElementPrefix><IsBaseElement>true</IsBaseElement><BalanceType>na</BalanceType><PeriodType>duration</PeriodType><IsReportTitle>false</IsReportTitle><IsSegmentTitle>false</IsSegmentTitle><IsCalendarTitle>false</IsCalendarTitle><IsEquityPrevioslyReportedAsRow>false</IsEquityPrevioslyReportedAsRow><IsEquityAdjustmentRow>false</IsEquityAdjustmentRow><IsBeginningBalance>false</IsBeginningBalance><IsEndingBalance>false</IsEndingBalance><IsReverseSign>false</IsReverseSign><PreferredLabelRole>terseLabel</PreferredLabelRole><FootnoteIndexer /><Cells><Cell FlagID="0" ContextID="Context_6ME__30-Jun-2013" UnitID=""><Id>1</Id><IsNumeric>false</IsNumeric><IsRatio>false</IsRatio><DisplayZeroAsNone>false</DisplayZeroAsNone><NumericAmount>0</NumericAmount><RoundedNumericAmount>0</RoundedNumericAmount><NonNumbericText>&lt;p style="font: 10pt/normal times new roman, times, serif; margin: 0px; font-size-adjust: none; font-stretch: normal;"&gt;&lt;font style="letter-spacing: -0.05pt; font-size: 10pt;"&gt;&lt;b&gt;Fair Value Measurements&lt;/b&gt;&amp;#160;&amp;#8212; &lt;/font&gt;&lt;font style="letter-spacing: 0.15pt;"&gt;The Company considers warrants that are not indexed to the Company&amp;#8217;s own stock to be classified as Level&amp;#160;3 in the fair value hierarchy. Level 3 valuations are based on inputs that are unobservable and significant to the overall fair value measurement. The degree of judgment exercised in determining fair value is greatest for instruments categorized in Level 3. During the three and six months ended June 30, 2013 and 2012, the Company did not grant any warrants not indexed to the Company&amp;#8217;s own stock. The following table presents the change in Level&amp;#160;3 liabilities:&lt;/font&gt;&lt;/p&gt;
&lt;p style="font: 10pt/normal times new roman, times, serif; margin: 0px; font-size-adjust: none; font-stretch: normal;"&gt;&lt;font style="font-size: 10pt;"&gt;&amp;#160;&lt;/font&gt;&lt;/p&gt;
&lt;table align="center" style="font: 10pt/normal times new roman, times, serif; width: 90%; border-collapse: collapse; font-size-adjust: none; font-stretch: normal;" cellspacing="0" cellpadding="0"&gt;
&lt;tr style="vertical-align: bottom;"&gt;
&lt;td nowrap="nowrap" style="text-align: center; text-indent: -8px; padding-left: 8px;"&gt;&amp;#160;&lt;/td&gt;
&lt;td nowrap="nowrap" style="padding-bottom: 1pt; font-weight: bold;"&gt;&amp;#160;&lt;/td&gt;
&lt;td nowrap="nowrap" style="text-align: center; font-weight: bold; border-bottom-color: black; border-bottom-width: 1pt; border-bottom-style: solid;" colspan="6"&gt;Three Months Ended June 30,&lt;/td&gt;
&lt;td nowrap="nowrap" style="padding-bottom: 1pt; font-weight: bold;"&gt;&amp;#160;&lt;/td&gt;
&lt;td nowrap="nowrap" style="padding-bottom: 1pt; font-weight: bold;"&gt;&amp;#160;&lt;/td&gt;
&lt;td nowrap="nowrap" style="text-align: center; font-weight: bold; border-bottom-color: black; border-bottom-width: 1pt; border-bottom-style: solid;" colspan="6"&gt;Six Months Ended June 30,&lt;/td&gt;
&lt;td nowrap="nowrap" style="padding-bottom: 1pt; font-weight: bold;"&gt;&amp;#160;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr style="vertical-align: bottom;"&gt;
&lt;td style="text-align: center; text-indent: -8px; padding-left: 8px;"&gt;&amp;#160;&lt;/td&gt;
&lt;td style="padding-bottom: 1pt; font-weight: bold;"&gt;&amp;#160;&lt;/td&gt;
&lt;td style="text-align: center; font-weight: bold; border-bottom-color: black; border-bottom-width: 1pt; border-bottom-style: solid;" colspan="2"&gt;2013&lt;/td&gt;
&lt;td style="padding-bottom: 1pt; font-weight: bold;"&gt;&amp;#160;&lt;/td&gt;
&lt;td style="padding-bottom: 1pt; font-weight: bold;"&gt;&amp;#160;&lt;/td&gt;
&lt;td style="text-align: center; font-weight: bold; border-bottom-color: black; border-bottom-width: 1pt; border-bottom-style: solid;" colspan="2"&gt;2012&lt;/td&gt;
&lt;td style="padding-bottom: 1pt; font-weight: bold;"&gt;&amp;#160;&lt;/td&gt;
&lt;td style="padding-bottom: 1pt; font-weight: bold;"&gt;&amp;#160;&lt;/td&gt;
&lt;td style="text-align: center; font-weight: bold; border-bottom-color: black; border-bottom-width: 1pt; border-bottom-style: solid;" colspan="2"&gt;2013&lt;/td&gt;
&lt;td style="padding-bottom: 1pt; font-weight: bold;"&gt;&amp;#160;&lt;/td&gt;
&lt;td style="padding-bottom: 1pt; font-weight: bold;"&gt;&amp;#160;&lt;/td&gt;
&lt;td style="text-align: center; font-weight: bold; border-bottom-color: black; border-bottom-width: 1pt; border-bottom-style: solid;" colspan="2"&gt;2012&lt;/td&gt;
&lt;td style="padding-bottom: 1pt; font-weight: bold;"&gt;&amp;#160;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: #cceecc;"&gt;
&lt;td style="width: 34%; text-indent: -8px; padding-left: 8px;"&gt;Balance at beginning of period&lt;/td&gt;
&lt;td style="width: 3%;"&gt;&amp;#160;&lt;/td&gt;
&lt;td style="width: 1%; text-align: left;"&gt;$&lt;/td&gt;
&lt;td style="width: 9%; text-align: right;"&gt;37,802&lt;/td&gt;
&lt;td style="width: 1%; text-align: left;"&gt;&amp;#160;&lt;/td&gt;
&lt;td style="width: 3%;"&gt;&amp;#160;&lt;/td&gt;
&lt;td style="width: 1%; text-align: left;"&gt;$&lt;/td&gt;
&lt;td style="width: 9%; text-align: right;"&gt;640,322&lt;/td&gt;
&lt;td style="width: 1%; text-align: left;"&gt;&amp;#160;&lt;/td&gt;
&lt;td style="width: 3%;"&gt;&amp;#160;&lt;/td&gt;
&lt;td style="width: 1%; text-align: left;"&gt;$&lt;/td&gt;
&lt;td style="width: 9%; text-align: right;"&gt;61,808&lt;/td&gt;
&lt;td style="width: 1%; text-align: left;"&gt;&amp;#160;&lt;/td&gt;
&lt;td style="width: 3%;"&gt;&amp;#160;&lt;/td&gt;
&lt;td style="width: 1%; text-align: left;"&gt;$&lt;/td&gt;
&lt;td style="width: 9%; text-align: right;"&gt;687,580&lt;/td&gt;
&lt;td style="width: 1%; text-align: left;"&gt;&amp;#160;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: white;"&gt;
&lt;td style="text-indent: -8px; padding-left: 8px;"&gt;Fair value adjustment&lt;/td&gt;
&lt;td style="padding-bottom: 1pt;"&gt;&amp;#160;&lt;/td&gt;
&lt;td style="text-align: left; border-bottom-color: black; border-bottom-width: 1pt; border-bottom-style: solid;"&gt;&amp;#160;&lt;/td&gt;
&lt;td style="text-align: right; border-bottom-color: black; border-bottom-width: 1pt; border-bottom-style: solid;"&gt;(11,425&lt;/td&gt;
&lt;td style="text-align: left; padding-bottom: 1pt;"&gt;)&lt;/td&gt;
&lt;td style="padding-bottom: 1pt;"&gt;&amp;#160;&lt;/td&gt;
&lt;td style="text-align: left; border-bottom-color: black; border-bottom-width: 1pt; border-bottom-style: solid;"&gt;&amp;#160;&lt;/td&gt;
&lt;td style="text-align: right; border-bottom-color: black; border-bottom-width: 1pt; border-bottom-style: solid;"&gt;(424,871&lt;/td&gt;
&lt;td style="text-align: left; padding-bottom: 1pt;"&gt;)&lt;/td&gt;
&lt;td style="padding-bottom: 1pt;"&gt;&amp;#160;&lt;/td&gt;
&lt;td style="text-align: left; border-bottom-color: black; border-bottom-width: 1pt; border-bottom-style: solid;"&gt;&amp;#160;&lt;/td&gt;
&lt;td style="text-align: right; border-bottom-color: black; border-bottom-width: 1pt; border-bottom-style: solid;"&gt;(35,431&lt;/td&gt;
&lt;td style="text-align: left; padding-bottom: 1pt;"&gt;)&lt;/td&gt;
&lt;td style="padding-bottom: 1pt;"&gt;&amp;#160;&lt;/td&gt;
&lt;td style="text-align: left; border-bottom-color: black; border-bottom-width: 1pt; border-bottom-style: solid;"&gt;&amp;#160;&lt;/td&gt;
&lt;td style="text-align: right; border-bottom-color: black; border-bottom-width: 1pt; border-bottom-style: solid;"&gt;(472,129&lt;/td&gt;
&lt;td style="text-align: left; padding-bottom: 1pt;"&gt;)&lt;/td&gt;
&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: #cceecc;"&gt;
&lt;td style="text-indent: -8px; padding-left: 8px;"&gt;Balance at end of period&lt;/td&gt;
&lt;td style="padding-bottom: 2.5pt;"&gt;&amp;#160;&lt;/td&gt;
&lt;td style="text-align: left; border-bottom-color: black; border-bottom-width: 2.5pt; border-bottom-style: double;"&gt;$&lt;/td&gt;
&lt;td style="text-align: right; border-bottom-color: black; border-bottom-width: 2.5pt; border-bottom-style: double;"&gt;26,377&lt;/td&gt;
&lt;td style="text-align: left; padding-bottom: 2.5pt;"&gt;&amp;#160;&lt;/td&gt;
&lt;td style="padding-bottom: 2.5pt;"&gt;&amp;#160;&lt;/td&gt;
&lt;td style="text-align: left; border-bottom-color: black; border-bottom-width: 2.5pt; border-bottom-style: double;"&gt;$&lt;/td&gt;
&lt;td style="text-align: right; border-bottom-color: black; border-bottom-width: 2.5pt; border-bottom-style: double;"&gt;215,451&lt;/td&gt;
&lt;td style="text-align: left; padding-bottom: 2.5pt;"&gt;&amp;#160;&lt;/td&gt;
&lt;td style="padding-bottom: 2.5pt;"&gt;&amp;#160;&lt;/td&gt;
&lt;td style="text-align: left; border-bottom-color: black; border-bottom-width: 2.5pt; border-bottom-style: double;"&gt;$&lt;/td&gt;
&lt;td style="text-align: right; border-bottom-color: black; border-bottom-width: 2.5pt; border-bottom-style: double;"&gt;26,377&lt;/td&gt;
&lt;td style="text-align: left; padding-bottom: 2.5pt;"&gt;&amp;#160;&lt;/td&gt;
&lt;td style="padding-bottom: 2.5pt;"&gt;&amp;#160;&lt;/td&gt;
&lt;td style="text-align: left; border-bottom-color: black; border-bottom-width: 2.5pt; border-bottom-style: double;"&gt;$&lt;/td&gt;
&lt;td style="text-align: right; border-bottom-color: black; border-bottom-width: 2.5pt; border-bottom-style: double;"&gt;215,451&lt;/td&gt;
&lt;td style="text-align: left; padding-bottom: 2.5pt;"&gt;&amp;#160;&lt;/td&gt;
&lt;/tr&gt;
&lt;/table&gt;
&lt;p style="font: 10pt/normal times new roman, times, serif; margin: 0px; font-size-adjust: none; font-stretch: normal;"&gt;&lt;font style="font-size: 10pt;"&gt;&amp;#160;&lt;/font&gt;&lt;/p&gt;
&lt;p style="font: 10pt/normal times new roman, times, serif; margin: 0px; font-size-adjust: none; font-stretch: normal;"&gt;&lt;font style="font-size: 10pt;"&gt;The fair value of these warrants was derived using the Black-Scholes pricing model.&amp;#160; The most significant input to the model is the Company&amp;#8217;s stock price, which was $1.20 and $1.99 at June 30, 2013 and 2012, respectively.&lt;/font&gt;&lt;/p&gt;
&lt;p style="font: 10pt/normal times new roman, times, serif; margin: 0px; font-size-adjust: none; font-stretch: normal;"&gt;&lt;font style="font-size: 10pt;"&gt;&amp;#160;&lt;/font&gt;&lt;/p&gt;
&lt;p style="font: 10pt/normal times new roman, times, serif; margin: 0px 0px 10pt; font-size-adjust: none; font-stretch: normal;"&gt;&lt;font style="font-size: 10pt;"&gt;The Company&amp;#8217;s financial instruments consist principally of accounts receivable, accounts payable and debt. The Company classifies its outstanding debt as Level&amp;#160;2 in the fair value hierarchy and estimated that its carrying value approximated fair value as of June 30, 2013. This estimate is based on acceptable valuation methodologies which use market data of similarly sized and situated debt issuers.&lt;/font&gt;&lt;/p&gt;</NonNumbericText><FootnoteIndexer /><CurrencyCode /><CurrencySymbol /><IsIndependantCurrency>false</IsIndependantCurrency><ShowCurrencySymbol>false</ShowCurrencySymbol><DisplayDateInUSFormat>false</DisplayDateInUSFormat></Cell></Cells><ElementDataType>nonnum:textBlockItemType</ElementDataType><SimpleDataType>na</SimpleDataType><ElementDefenition>Disclosure of accounting policy for fair value measurements, which may include, but is not limited to, how an entity that manages a group of financial assets and liabilities on the basis of its net exposure measures the fair value of those assets and liabilities.</ElementDefenition><ElementReferences>Reference 1: http://www.xbrl.org/2003/role/presentationRef

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 -Name Accounting Standards Codification

 -Topic 235

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 -Name Accounting Standards Codification

 -Topic 820

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</LabelSeparator><Level>2</Level><ElementName>us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock</ElementName><ElementPrefix>us-gaap_</ElementPrefix><IsBaseElement>true</IsBaseElement><BalanceType>na</BalanceType><PeriodType>duration</PeriodType><IsReportTitle>false</IsReportTitle><IsSegmentTitle>false</IsSegmentTitle><IsCalendarTitle>false</IsCalendarTitle><IsEquityPrevioslyReportedAsRow>false</IsEquityPrevioslyReportedAsRow><IsEquityAdjustmentRow>false</IsEquityAdjustmentRow><IsBeginningBalance>false</IsBeginningBalance><IsEndingBalance>false</IsEndingBalance><IsReverseSign>false</IsReverseSign><PreferredLabelRole>terseLabel</PreferredLabelRole><FootnoteIndexer /><Cells><Cell FlagID="0" ContextID="Context_6ME__30-Jun-2013" UnitID=""><Id>1</Id><IsNumeric>false</IsNumeric><IsRatio>false</IsRatio><DisplayZeroAsNone>false</DisplayZeroAsNone><NumericAmount>0</NumericAmount><RoundedNumericAmount>0</RoundedNumericAmount><NonNumbericText>&lt;p style="font: 10pt/normal times new roman, times, serif; margin: 0px; font-size-adjust: none; font-stretch: normal;"&gt;&lt;font style="font-size: 10pt;"&gt;&lt;b&gt;Recently Issued Accounting Standards&lt;/b&gt; &amp;#8212; In the normal course of business, the Company evaluates all new accounting standards issued by the Financial Accounting Standards Board, Securities and Exchange Commission, Emerging Issues Task Force, American Institute of Certified Public Accountants and other authoritative accounting bodies to determine the potential impact they may have on the Company&amp;#8217;s financial statements. Based upon this review, management does not expect any of the recently issued accounting standards to have a material impact on the Company&amp;#8217;s financial statements.&lt;/font&gt;&lt;/p&gt;</NonNumbericText><FootnoteIndexer /><CurrencyCode /><CurrencySymbol /><IsIndependantCurrency>false</IsIndependantCurrency><ShowCurrencySymbol>false</ShowCurrencySymbol><DisplayDateInUSFormat>false</DisplayDateInUSFormat></Cell></Cells><ElementDataType>nonnum:textBlockItemType</ElementDataType><SimpleDataType>na</SimpleDataType><ElementDefenition>Disclosure of the adoption of new accounting pronouncements that may impact the entity's financial reporting.</ElementDefenition><ElementReferences>No definition available.</ElementReferences><IsTotalLabel>false</IsTotalLabel><UnitID>0</UnitID><Label>Recently Issued Accounting Pronouncements</Label></Row><Row FlagID="0"><Id>4</Id><IsAbstractGroupTitle>false</IsAbstractGroupTitle><LabelSeparator>

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