bloomz 
Part of our Complete Guide to School-to-Home Communication.
“Contactability” has become one of the most quoted numbers in school communication. You will see claims like 99 percent of families reachable, often presented as the headline proof that a platform works. It is a useful metric and a real improvement over the days of returned-to-sender paper notices. But it is also a number that can flatter a system that is not actually serving families well. If you are evaluating platforms, it helps to understand what contactability measures, where it stops measuring, and what reaching every family really requires.
What contactability actually measures
At its core, contactability measures the percentage of families for whom the system has a valid, deliverable contact point: a working phone number, email, or app connection across at least one channel. A high contactability rate means messages are technically getting delivered rather than bouncing. That is a genuine and worthwhile thing to measure. A district that moves from 80 percent to 98 percent deliverability has closed a real gap, especially for emergencies.
Where the number can mislead
The trouble is that “a message was delivered” and “a family was reached” are not the same thing. A few ways a strong contactability number can hide a weak reality:
- A delivered message can sit unread. It can land in an inbox or as an SMS and never be opened. Contactability counts the delivery, not whether anyone took it in.
- Delivery in the wrong language reaches no one. If a family does not read English and the message arrives in English, it was technically contactable and practically useless. The system logs a contact; the communication never happened.
- One channel rarely covers everyone. Counting a family as reachable because you have one stale email on file overstates real reach. The parent who only picks up the phone is reached on completely different terms than the one living in the app.
- Even a read message can be a dead end. A delivered, understood note still travels one way. Whether a family can reply or complete a form is a separate question.
None of this makes contactability a bad metric. It makes it an incomplete one, a floor rather than a finish line.
What reaching every family really requires
If the goal is genuine reach rather than a flattering dashboard, four things matter beyond raw deliverability.
Multichannel delivery
Families answer on different channels. Reaching everyone means one message going out across app push, SMS, email, and voice, not betting on the single channel a family happens to ignore. The most at-risk family is often the one not yet on the app.
Read receipts and follow-up
Knowing who has not seen a message is what lets you follow up with the few who need it, instead of re-blasting everyone. Reach improves when you can see the gap and close it, not just when you can claim a delivery rate.
Language
This is the big one. A message delivered in a language a family cannot read is not a contact, it is a number. Real reach means the message, and ideally the whole experience, arrives in the family’s language. For multilingual districts, this is where many high-contactability systems quietly fail.
Two-way capability
Reaching a family should let them reach back. A platform where families can reply, excuse an absence, or complete a form, in their own language, turns a delivery statistic into an actual relationship.
How Bloomz approaches reach
Bloomz treats contactability as the starting point, not the headline. Messages go out across app, SMS, email, and voice through the communication hub, with read visibility so staff can follow up with the families who have not seen something rather than re-blasting everyone. Crucially, the same messages reach families in 250+ languages through immersive translation, and families can reply in their own language. The goal is a message that gets read, understood, and answered, not one that merely leaves the building.
Look past the percentage
When a platform leads with a contactability percentage, treat it as a starting question rather than a final answer. Ask what happens after delivery. Was the message read, was it in the family’s language, and could the family write back? Real reach is the sum of those answers, not a single number on a slide. Bring your district’s languages and channels and schedule a demo to see what that looks like in practice.