Ziggurat Model and Underlying Characteristics Checklists

We accept credit cards, PayPal, and purchase orders

(please contact us about orders to UK, Australia, and New Zealand)

For customers paying by purchase order: To start the process, after you make your product selections, select “purchase order” as your form of payment and complete the order request. You will receive an invoice by email. Please contact us directly to complete the required documents to fulfill the order (contact details are provided as you complete your order).