Since you can use constraints to make anything from simple relationships to complex mathematically-based constructs that generate random variables to subtly affect objects, there are three different types of constraints you can use, depending on your approach:

• a simple fill-in-the-blanks formula found in the Navigator window (A). Most constraints are of this basic type.
• a mathematical spreadsheet-style system called Expression constraints.
• a graphical approach called Relations constraints where you “connect the dots” by drawing connections between the data, represented by boxes
  

  Constraint types A. Simple constraint B. Expressions constraint C. Relations constraint