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Is there a legal need to use accessibility standards for recording buildings as a record of different phases of building for archaeologists, architectural historians, architects ie for the professionals involved with analysing and conserving buildings/standing remains? The colour etc coded layered CAD drawings I've seen certainly make it a lot easier for a non-colour-blind person to understand building and alteration phases. There are few colours that are distinguishable to all the people with various types of colour-blindness. Using different hatchings could help the colour-blind to distinguish different layers whilst not making drawings less easy to read for the colour-sighted. Incidentally, dyslexic archaeologists and architects seem to be more common than colour-blind ones. Janet Davis Pat Reynolds wrote: ...The actual colours to use are also important to meet accessibility standards: colours should be selected which are perceived as distinct to people with colour blindness, and no colour perception (see the RNIB 'see it right' guidelines for further information - there's also an interesting website, whose url temporarily escapes me, that shows pictures and diagrams as might be seen by people with various types of colour blindness - it also advertises software which will take your diagram and change its colours so they become distinct. The tone to be used will be partially determined by context: the bright sunlight (????) occasionally experienced in a site interpretation plaque at 1m from the viewer calls for different tones than a paper plan, and a computer screen is so dependent on users that specification is meaningless! ...