Search this site

Get in touch

Contact Terry Freedman

Thought for the day

Each day a randomly-selected "law", observation or suggestion will appear here.

Last 100 articles
Free subscriptions

Free guide to using interactive whiteboards

IWB Guide Cover26+ suggestions and tips. Free to subscribers of Digital Education (please see the link below)

 Subscribe to our free newsletter, Digital Education!

 It's free. Signing up entitles you to various freebies. We use a double opt-in system, and we won't spam you.

Click the image above for a free sample edition.

Sign-up page.

The DfE Assessment Innovations series collated. This booklet is free to subscribers of Digital Education.

Be notified by email if you prefer:

Preview | Powered by FeedBlitz

The Amazing Computer Education Project Book

Remember this?

Amazing Web 2.0 Projects

It’s been downloaded over 35,000 times. I’m hoping to create a similar Computer Education Projects book, which will also be free. Find out how you can help by reading this article:

The Amazing Computer Education Projects Book

Digital Education

News, views and reviews. In-depth articles. Guest contributors. Competitions. Discount codes.

(Not necessarily all in the same issue, but each issue is full of good stuff nonetheless!)

Sign up for our free newsletter now!

Oh No!!If you can't find what you're looking for...

Assuming you’ve tried variations of your search term and checked the spelling without any luck, you may find the article Finding stuff on the ICT in Education website helpful.

Alternatively, if it’s not an article you’re looking for, try looking through the menus at the top of the screen.

E-Books for Sale

Want to make your ICT lessons more interesting?

Then Go on, bore ‘em: How to make your ICT lessons excruciatingly dull is just right for you.

Clustr Map
Terry Freedman's Social Profile
Powered by Squarespace

« Web 2.0 Project: Paula Naugle's work | Main | Web 2.0 Project: Damian Maher's Work »

21 rules for computer users


Rosenstock-Huessy's Law of Technology

All technology expands the space, contracts the time, and destroys the working group.

Sattingler's Principle

It works better if you plug it in. If it still doesn't work, switch it on.

Ninety-nine Rule of Project Schedules

The first ninety percent of the task takes ninety percent of the time, the last ten percent takes the other ninety percent.

Grosch's Law

Computing power increases as the square of the cost. If you want to do it twice as cheaply, you have to do it four times as fast.

Computer Rule

To err is human but to really foul things up requires a computer.

Lubarsky's Law of Cybernetic Entomology

There's always one more bug.

Gallois's Revelation

If you put tomfoolery into a computer, nothing comes out but tomfoolery. But this tomfoolery, having passed through a very expensive machine, is somehow ennobled, and no one dares to criticise it.

Westheimer's Rule

To estimate the time it takes to do a task: estimate the time you think it should take, multiply by two, and change the unit of measure to the next highest unit. Thus we allocate two days for a one-hour task.

Peers's Law

The solution to a problem changes the problem.

Gilb's 1st law of unreliability

Computers are unreliable, but humans are even more unreliable.

Gilb's 2nd Law of Unreliability

Any system which depends on human reliability is unreliable.

Gilb's 3rd Law of Unreliability

Undetectable errors are infinite in variety, in contrast to detectable errors, which, by definition, are limited. Investment in reliability will increase until it exceeds the probable cost of errors, or until someone insists on getting some useful work done.

These rules were coined by Thomas Gilb, a systems engineer.

Shipman's First Law

ICT capability is inversely related to seniority within an organisation.

Shipman's Second Law

The length of time required for a task is inversely related to its simplicity.

Freedman's Postulate

The reliability of computer systems is inversely related to the urgency of the task.

Allen's Axiom

When all else fails, read the instructions.

Gall's Second Principle of Systemantics

New systems generate new problems.

Coffee's observation

If you do not have anything to say, a word processor
will not say it ~ Peter Coffee

Peers's Law

The solution to a problem changes the problem.

Richards' First Law of Data Security

Don't buy a computer.

Richards' Second Law of Data Security

If you do buy a computer, don't turn it on.

Thanks to David Harley for providing me with these last two rules.

First published in InTegrate, March 1995.

You may also find 7 rules for ICT teachers, co-ordinators and leaders interesting.

PrintView Printer Friendly Version

EmailEmail Article to Friend

Reader Comments (3)

Neil's first dictum: there's always a quicker way
Corrollary: and some *&%*$&$@ will tell you "I could have done that in two minutes" just after you have collapsed exhausted after three hours of sweat and tears
April 1, 2011 | Unregistered CommenterNeil Adam
Neil's eternal truth: printers are malevolent beasts
April 1, 2011 | Unregistered CommenterNeil Adam
Ha, I can relate to both of those! thx Neil

PostPost a New Comment

Enter your information below to add a new comment.
Author Email (optional):
Author URL (optional):
Some HTML allowed: <a href="" title=""> <abbr title=""> <acronym title=""> <b> <blockquote cite=""> <code> <em> <i> <strike> <strong>