ok... so your tip is" SUITABILITY" meaning make sure it is suitable for the client? and you think that most of us dont consider the needs of the client before proceeding with our plan for them? You are using words like "suitability , strength and sustainability "as would a business or corporate type would and applying them in the context of a hairdressing tip, and i cant understand why. By the way I am a professional in your field for over 30 years and have worked in some of the best salons in the world and im trying to understand why you are reaching out to us here on youtube with this kind of wordplay. please elaborate ...you look like a talented and brite artist who wants to connect with others unless im missing your point . Thanks for posting