It says it has issued a series of materials called Respecting Others which give anti-bullying guidance:
Inspectors say too many pupils suffer from bullying during their school lives.
A report published today by Estyn also says schools have a responsibility to tackle bullying in all forms under the Education Act 2002, but the ways in which schools deal with bullying varies widely.
'Action on bullying', found that even schools with good strategies to address the problem don't have a common understanding of how important it is to focus on groups of pupils with a higher-than-average risk of being bullied.
They include gay, lesbian and transgender pupils, those with a disability and pupils from a minority ethnic background.
Actor Spencer Wilding's acting credits include appearances in Harry Potter, Wrath of the Titans, Batman, Game of Thrones and Dr Who. But now he's taken on a new role, as patron of a campaign which is tackling bullying in the North Wales town where he went to school.
Shocking figures have been released on the number of our children and young people who are being bullied online.
The information comes from the Princes Trust. They've found 14% of youngsters report being bullied online. 20% of youngsters say they've seen more bullying online than in person
39% of the youngsters have friends online who they've never met face to face.
ITV Wales has been hearing from one young victim, who's a member of the celebrated Welsh choir, Only Boys Aloud.
You can see more on tonight's edition of 'Hacio' - on S4C at 9.55pm.
The modern world of reality TV and social media has helped make a star of Morgan Westcott - a singer in choir Only Boys Aloud - but it's also made him a victim of cyber bullying.
It comes as figures released by The Prince's Trust show one in five young people have been bullied online.
You can see more on our current affairs programme 'Hacio' - on S4C at 9.55pm tonight.
A member of the Only Boys Aloud choir, Morgan Westcott, speaks out about how cyber-bullying "knocks his confidence."
Plaid Cymru leader Leanne Wood insists there needs to be 'consistency' in the way records are compiled on incidents of homophobic bullying in schools. She says that 'unless we have a true picture of exactly what's going on, then it's very difficult to put policies in place to overcome the problem.'