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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part III, Line 4b, Membership (continued)</FormAndLineReferenceDesc>
        <ExplanationTxt>Professional Development: The primary vehicle through which professional development is accessed by members is SLA's online learning portal, which provides an excellent source of professional development opportunities including continuing education programs, webinars and leadership training. Mini or Regional Conferences offer members another face-to-face opportunity to dig deeper into a special interest, subject area, or regional matter and to do so with a selection of industry partners. Publications: Information Outlook is the Association's bimonthly online magazine. Information Outlook contains: Articles on timely topics such as data curation, digital asset management, bibliometrics, and value co-creation; Columns about technology, copyright law, and other issues of perpetual interest; and News items about developments within the information profession and SLA. A popular feature is the SLA Member Interview, which offers a close-up look at information professionals in different disciplines, work environments, and countries. Career Services: SLA's Career Center provides access to job opportunities and career resources and publications.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section A, line 3</FormAndLineReferenceDesc>
        <ExplanationTxt>SLA utilizes the services of a management firm, MCI USA to manage the organization on a day-to-day basis. Management fees represent amounts paid to MCI USA under the terms of an agreement for management services including all staff resources; delivery of SLA's programs, services, events, and website; provides for office space, equipment, and other resources needed to manage the day-to-day operations. Management fees totaled $1,564,997 for the year ended December 31, 2017. SLA's Executive Director is an employee of and was compensated by MCI USA.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section A, line 6</FormAndLineReferenceDesc>
        <ExplanationTxt>The Association has members.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section A, line 7a</FormAndLineReferenceDesc>
        <ExplanationTxt>Election of officers and directors shall be by secret ballot sent to each voting member.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section A, line 7b</FormAndLineReferenceDesc>
        <ExplanationTxt>Each voting member shall have one (1) vote on all matters submitted to a vote of the voting members.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, line 11b</FormAndLineReferenceDesc>
        <ExplanationTxt>The Federal Form 990 is reviewed by management and then shared with the Board of Directors prior to filing with the Internal Revenue Service.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, line 12c</FormAndLineReferenceDesc>
        <ExplanationTxt>The Board of Directors annually reviews the conflict of interest policy at its orientation meeting and discloses any potential conflict of interest. All members of the Board of Directors sign a conflict of interest disclosure statement and code of responsibility annually. The signed documents are reviewed by the directors, executive office relations, and kept on file by SLA. The conflict of interest policy is always taken into consideration when there is the potential for conflict, particularly when signing new contracts or beginning new relationships. Any possible appearance of conflict of interest that arises in the course of business is researched to determine the existence of a conflict. If a contract is to be made with a related party, it is disclosed to the Board of Directors and a vote is taken to reach a decision. If the Association's staff members identify a conflict of interest, management shares this information with the Executive Committee of the board for its action. Involved board members are precluded from voting on matters for which a conflict exists.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section C, line 19</FormAndLineReferenceDesc>
        <ExplanationTxt>The Federal Form 990, all governing documents, conflict of interest policies, financial statements, and all policy and practice documents are available upon request. The conflict of interest policy is available on the Association's website. All board of directors agenda and minutes are posted in the governance section of the website.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part XII, Line 2c:</FormAndLineReferenceDesc>
        <ExplanationTxt>The Association's Executive Committee assumes responsibility for oversight of the audit of its financial statements and selection of an independent accountant. The process is consistent with previous years.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
  </ReturnData>
</Return>