Decision Grids

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The Common Knowledge Decision Grid rule format is used to represent business rules that are a function of two or more inter-related conditional groupings. The grid consists of one or more row conditions and one or more column conditions with the intersections of the row and column conditions being grid entries to which a range of complex actions can be attached.

For example, the following simple, two condition Decision Grid defines the valid combinations of insurance premiums given vehicle and driver details and the location where the vehicle is garaged.

Decision Grid Rule Format

Like all Common Knowledge rule formats, the Decision Grid rule format seamlessly integrates with Common Knowledge Designer and the Common Knowledge SDK and can be easily combined with other business rule formats to create powerful solutions to complex business rule problems.


Common Knowledge Decision Grids provide capabilities in a number of areas to enable you to create structured, readable and accessible representations of your business rules.

Multiple Conditions Specify multiple column types or row types to represent two or more dimensions in the Decision Grid
Interactive Execution Standalone execution of Decision Grid entirely within Common Knowledge Designer
Explanations Add explanations in the form of Reason Strings to any rule in the Decision Grid
Documentation Ability to attach custom information to your rules which will be included in generated documentation


Common Knowledge Decision Grids incorporate an ever-growing list of features that assist you during the design, authoring, execution and testing of your table-based business rules. Features include:

Multiple Conditions Choose if single (or multiple) actions, rows or columns can match conditions
Nested Rules Ability to embed execution of any other ruleset anywhere within the Decision Grid
Complex Expressions Specify complex expressions as the conditions and actions within a Decision Grid to perform a range of operations including comparison (set, boolean and arithmetic), maths, statistics, string handling, financial, and date & time
Interactive Debugger An interactive debugger that can step through Decision Grids with support for breakpoints, stack tracing and expression evaluation
Multiple Actions Ability to define an arbitrary number of complex actions for each rule
Rule Activation Colour-highlighting of evaluated conditions and executed actions within the Decision Grid
Editing Easy reordering and renumbering of columns and rows within Decision Grid
Cell Merging Easy auto-merge of common-valued row or column entries
Cell Formatting Auto-sizing of grid columns for easy layout formatting