Defining test-case complexity [Q]

I'm involved with a group of people who are trying to set up

some benchmarks for test-vector qualification using Cadence's

Verilog-XL simulator. One of the interim goals of this effort

is to arrive at some means of defining quantities that will

represent the level of complexity for test case designs and

vector sets. Aspects of the designs such as the ratio of

sequential to combinational cell models or level of hierarchy

are under consideration. Also being examined are total num-

ber of toggles vs. number of vectors for vector sets.

If anybody has any ideas on how to define metrics such as this,

or can point me to some literature that would be helpful, I'd

appreciate it. Thanks in advance.

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Mark Shaw

Texas Instruments - ASIC

214.917.7124