Rate routine steps

Each rate routine has one or more instructions that define the rating algorithm. Each instruction is composed of one or more steps. Each step has the following fields:

• Instruction – This field is the target of an assignment operator, a conditional instruction, or the start of a section comment. Blank for other operators. The instruction field types can be properties on the cost, parameters including rate modifiers, variables, and conditionals. This instruction field is not the same as an instruction, which is composed of one or more steps.
• Operator – An assignment, arithmetic, or rounding operator. Blank for conditional instructions.
• Opening parentheses (optional) – One or more opening parentheses to group a series of steps.
• Operand – The operand of the current step. Operands types can be properties on the cost, functions, parameters, rate tables, variables, conditional expressions, constants, date constants, typelist values, and scale for rounding operators.
• Closing parentheses (optional) – One or more closing parentheses to group a series of steps.
• Line comment– Optional description of the step.

For example, you can represent a rate routine that calculates the coverage premium for personal auto. In the following table, each row corresponds to a step:

#	Instruction	Op	(	Operand	)	Line comment
1	--	Base Rate and Adjusted Rate Calculation
2	BaseRate	←		table:Base Rate		The instruction field is the BaseRate field on a cost. The ← operator assigns the operand to the BaseRate in the instruction field.
3		R		.001		Round Base Rate to thousandths (Round Half Up)
4	vehicleTypeFactor	←		table:Vehicle Type Factor
5	vehicleCostFactor	←		table:Vehicle Cost Factor
6	AdjustedRate	←		BaseRate		Determine adjusted rate. The instruction field and operand are properties on the cost.
7		X		table:Coverage Factor		Operand is a rate table.
8		X		table:UW Co Factor		Operand is a rate table.
9		X		Policy Line.PAMultiCarDiscount		Operand is a parameter.
10		X		min(vehicleCostFactor, vehicleTypeFactor)		Operand is a function.
11
12	--	Term Amount Determination
13	IF			AdjustedRate < table:Min Premium AND Vehicle.VehicleType = VehicleType.Other		The instruction field begins a conditional instruction, and operand is a conditional expression.
14	TermAmount	←		table:Min Premium		The instruction field is the TermAmount field on a cost, and operand is a rate table.
15		RU		10		Round up minimum premium to tens.
16	ELSE					Continue the conditional instruction begun in step 13.
17	TermAmount	←		AdjustedRate		Use system default rounding.
18	ENDIF					End of the conditional instruction begun in step 13.

In the rate routine, steps 2 and 3 make up one instruction. Steps 4 and 5 are each a single line instruction. Steps 6 through 10 are one instruction. Steps 13 through 18 are a conditional instruction.

Steps 1 and 12 are section comments that span the whole step.