Because i've just had a look at mine and i'm nosey
NW = Assets - Liabilities
Assets include:
Cash (Cash in hand, savings etc)
Investments (Stocks etc)
Personal (house cost, car cost, home furnishings, jewelry etc)
Retirement (Pension etc)
Liabilities include:
Unsecured (Credit card, student loan etc)
Secured (Mortgage, car loan, home equity loan etc)
Mine (which includes my partner as everything is joint so impossible to seperate) came out at +£10,000 (but that doesn't include any pension as i don't have an estimate yet).
Not sure what i think of that to be honest but it killed 5 minutes.