<?xml version="1.0" encoding="utf-8"?>
<!--
Taxonomy based on XBRL standard Version 2.1.
Created by UBmatrix Taxonomy Designer 3.0.2756.2310 (2007-05-12 03:16).  
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Copyright (c) 2002-2007 UBmatrix inc., All Rights Reserved
Produced on 2007-06-14 08:01:54
-->
<schema xmlns="http://www.w3.org/2001/XMLSchema" xmlns:xbrli="http://www.xbrl.org/2003/instance" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:ci="http://www.xbrl.us/patterns/2007/MovementsInTuple" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" targetNamespace="http://www.xbrl.us/patterns/2007/MovementsInTuple" elementFormDefault="qualified" attributeFormDefault="unqualified">
  <annotation>
    <appinfo>
      <link:linkbaseRef xlink:type="simple" xlink:href="MovementsInTuple-label.xml" xlink:role="http://www.xbrl.org/2003/role/labelLinkbaseRef" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:title="Label Links, all" />
      <link:linkbaseRef xlink:type="simple" xlink:href="MovementsInTuple-presentation.xml" xlink:role="http://www.xbrl.org/2003/role/presentationLinkbaseRef" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:title="Presentation Links, all" />
      <link:linkbaseRef xlink:type="simple" xlink:href="MovementsInTuple-calculation.xml" xlink:role="http://www.xbrl.org/2003/role/calculationLinkbaseRef" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:title="Calculation Links, all" />
      <link:linkbaseRef xlink:type="simple" xlink:href="MovementsInTuple-definition.xml" xlink:role="http://www.xbrl.org/2003/role/definitionLinkbaseRef" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:title="Definition Links, all" />
    </appinfo>
  </annotation>
  <import namespace="http://www.xbrl.org/2003/instance" schemaLocation="http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd" />
  <import namespace="http://xbrl.org/2005/xbrldt" schemaLocation="http://www.xbrl.org/2005/xbrldt-2005.xsd" />
  <element id="ci_AllShareOwnershipPlans" name="AllShareOwnershipPlans" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" abstract="true" nillable="true" />
  <element id="ci_PlanA" name="PlanA" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" abstract="true" nillable="true" />
  <element id="ci_PlanB" name="PlanB" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" abstract="true" nillable="true" />
  <element id="ci_ScheduleOfShareOwnershipPlansTextBlock" name="ScheduleOfShareOwnershipPlansTextBlock" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" />
  <element id="ci_ShareOwnershipPlanDescription" name="ShareOwnershipPlanDescription" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" />
  <element id="ci_ShareOwnershipPlanDimension" name="ShareOwnershipPlanDimension" type="xbrli:stringItemType" substitutionGroup="xbrldt:dimensionItem" xbrli:periodType="duration" abstract="true" nillable="true" />
  <element id="ci_ShareOwnershipPlanGeneralTermsAndConditions" name="ShareOwnershipPlanGeneralTermsAndConditions" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" />
  <element id="ci_ShareOwnershipPlanHypercube" name="ShareOwnershipPlanHypercube" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="duration" abstract="true" nillable="true" />
  <element id="ci_ShareOwnershipPlanShareOptionsExercised" name="ShareOwnershipPlanShareOptionsExercised" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" />
  <element id="ci_ShareOwnershipPlanShareOptionsExpired" name="ShareOwnershipPlanShareOptionsExpired" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" />
  <element id="ci_ShareOwnershipPlanShareOptionsForfeited" name="ShareOwnershipPlanShareOptionsForfeited" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" />
  <element id="ci_ShareOwnershipPlanShareOptionsGranted" name="ShareOwnershipPlanShareOptionsGranted" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" />
  <element id="ci_ShareOwnershipPlanShareOptionsOutstanding" name="ShareOwnershipPlanShareOptionsOutstanding" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" />
  <element id="ci_ShareOwnershipPlanShareOptionsOutstandingIncreaseDecrease" name="ShareOwnershipPlanShareOptionsOutstandingIncreaseDecrease" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" />
  <element id="ci_ShareOwnershipPlanShareOptionsOutstandingIncreaseDecreaseAbstract" name="ShareOwnershipPlanShareOptionsOutstandingIncreaseDecreaseAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" />
  <element id="ci_ShareOwnershipPlanShareOptionsOutstandingMovementsAbstract" name="ShareOwnershipPlanShareOptionsOutstandingMovementsAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" />
</schema>
