Usability can definitely be measured - just needs different tools to measure it.
Plenty of companies out there who will work with a business to measure usability - whether it is layouts of a store - a brochure - or a website.
would feel that we need to quantify this -
the issue is not length - it is un-necessary length
if the point has been made once - get on with it - it does not need to be made another 5 times...
and the reality is that the majority of these that I have seen - and I have stumbled across far too many

- deliberately obfuscate the points...
I have no issue with long documents - I would happily read a 600 page academic paper which is succinct and to the point - with precis / structured content / examples / evidence / conclusions / bibliographies / etc. - length is not the issue - I would not happily read that same 600 page paper if in fact the paper has only one point and dances around the issue - trying to show more value with un-necessary length...
lets have an exercise on here - to take examples of these LSLs and distill them down to the shortest text we can without losing the points being made... i.e. the absolute minimum distillation of their text
I would guess they would become rather a lot shorter...
so the issue isn't the length per se - it is the style of writing / layout designed to keep returning to the same point - without ever quite making it - because the seller knows that making the point simply and succinctly will show rather less substance than can be implied by the lengthy meaningless drivel they can post instead
I am sure that if we look at print we have all seen those 'cheap adverts' in the back of the Sunday supplements - for memory systems / cheap shoes (claiming to be handmade in Nottingham!) / how I made £1 trillion in a week and you can do the same / etc. - they all follow this same format - now compare those against adverts by Nike / Bentley / Asprays / Apple / etc. etc. - just a touch simpler...
have a look at:
www.huwandgary.com (it is not selling you anything - it is a portfolio of a couple of ad guys - just happens to be a website I did)
that is an example of top level advertising by major international companies - we can assume I think that they are highly successful adverts - yet none of them follow this format - why? simply because they have something clear to sell... and the punter wants it...
In my view - the LSL format is used because it is more successful in converting in situations where there is a less robust offer
where the product is good / established brand / meets an obvious need - this format is not needed - simplicity is the name of the game...
where in all the advertising carried on our websites do advertisers ask for an area 980px x 40,000px? they don't - they get their message across in an area perhaps 900px x 150px - because they have a product / offer which can be summarised in that space...
so, the space is not being used as the best mechanism for the user
where a product / offer is good, vastly less space is needed
therefore the reason for a LSL is to confuse / obscure / hide the real detail until you have committed in some way...
there is no need to cover the content of a 15 minute video - if you can't summarise your offer in 6 lines you haven't got a coherent offer -
or you have a coherent offer, but if the punter knew the real offer they might not buy!
so - yes, they might be more successful - for offers which are undefined / vague / unlikely / etc. - but clearly not in the real world for crisp / simple / powerful offers which manage in far smaller spaces - therefore the mere existence of such an approach tells me a lot about the offer...
perhaps the British Public needs educating!
Alasdair
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