MAINTENANCE is the activity involved in maintaining something in good working order. May include replacement of significant portions of the item(s) being maintained.
ATA (Accredited Tax Advisor), in the US, is a national credential conferred by Accreditation Council for Accountancy and Taxation to professionals who handle sophisticated tax planning issues, including ownership of closely held businesses, qualified retirement plans and complicated estates.
IAS is Institute of Asset Management (UK).
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