Is behaviour really that much worse than in the past? Or, has your perception of events changed? I still have difficulty in understanding why people are resistant to the diagnosis of x disorder (usually of a developmental nature). Rather than seeing it as an 'excuse', surely it is an explanation for whatever behaviour? This makes your job easier, because it gives you tools to deal with it: even if you don't choose to acknowledge that they are dyslexic/dyspraxic/ADHD/ASD, they won't change to become perfectly behaved. Why is it difficult to acknowledge that someone is more knowledgeable about a pupil than you are? I honestly think that is the crux of many teachers' arguments. They find it a challenge to accept that parents/other professionals know a child, and can make a decision about them without their consultation.