I’m an organizer-a professional organizer. With everyone’s busy schedules, especially in dual families like mine, it’s inevitable that even when I make up a calendar, mail it, e-mail it, or talk about it, I still hear, “You never told me,” or “I never got it,” or “I don’t remember that.” My carefully annotated spreadsheet noting camps and visitations with specific colors-and even my electronic Treo-doesn’t clarify everything.

Luckily, someone else has been hard at work at solving our problems. Bill Moritz, PhD, of San Diego, CA, has developed ShareKids.com, the outgrowth of an early 1980s educational and child-care computer program called Teachers’ PET. And “Dr. Bill,” as he calls himself, continues to evolve the system, adding on features regularly as users make requests.

In fact, when you log in to www.sharekids.com (once you’re a member), you’ll see the value in this system right up front: Co-Parenting Assistant. This complex “assistant” helps track everything from homework assignments to prescriptions, class and sports or other activity schedules, and vacation weeks and visitations. A color-coded calendar keeps everyone straight. Note insurance information, find resources, post photos, or chat with lawyers, mediators, long-distance partners. For $10 a month for each parent (or $100 per year) and a bit of time to set up, it’s totally worth the trouble and the cash. You can even track expenses and shared payments.

All these features will go a long way toward defusing those inevitable disagreements and confused phone calls, but a special element even stops the memory lapses over the agreement: A section called “The Rules” details the court order or other original document.  And a personal, unchangeable diary can stop those “I never said that” statements.

If you’re a co-parent, you owe it to yourself to explore ShareKids.

Valerie Walker is owner of Destination Organized (www.destinationorganized.com).