An ACL is an Approve Components List, sometimes called an Approved Parts List. It maps internal part numbers to one or more manufacturer part numbers that have been qualified for use within a company.

An AML is an Approved Manufacturer List, sometimes called an Approved Supplier List or Approved Vendor List. It is a list of Manufacturers and Suppliers that are approved by your company. Being on the list means they comply with all of your corporate and other requirements for your company to purchase from.

Maintaining a quality ACL is a proven way to reduce risks within your designs. It ensures that your designers are using the best possible parts with the longest life, which extends the life of your overall product.

Having an AML may be required for your particular industry, the top 2 being Aerospace/Defense and Medical. Having an AML can also reduce costs, by forcing purchases through suppliers that you have higher discounts with.