Some stress management resources that you might find helpful.
Health and Safety Executive Line Manager Competency Indicator - This is an interactive questionnaire for managers that will help identify how well they cope with stress at work, identify sources of work-related stress, and indicate if any training is needed.
What is stress, and what are some of the symptoms? - Signs that your employee is stressed - from Busines Link
Great report on presenteeism - Why do Employees Come to Work When Ill? - from the Work Foundation
Some legal guidance for HR people - Work-Related Stress: what the law says - from CIPD, you have to register for a free account to download this report
Morale and resilience check up tool - from Cary Cooper et al, a quick pdf you can work through to help you think about potential threats to well-being, and what you can do about it.
Discussion of causes and effects of Teacher Stress - a bit scholarly, but interesting
Fantastic example Stress Management Tool Kit for Managers and Staff - from Suffolk Mental Health Partnership NHS Trust, this is packed with information and resources to help with stress reduction, but it's short and easy to use.
CIPD and Simply Health Study on Stress and Absenteeism - Stress is the most common cause of long term sickness absence for all workers
Some books
Finding Flow: The Psychology of Engagement with Everyday Life, by Mihaly Csikszentmihalyi
Managing the Causes of Work-related Stress: A Step-by-step Approach Using the Management Standards - HSE
Emotions Revealed - Paul Ekman, not strictly speaking about stress but offers some guidance about to read emotions in the voice and face so we can be more senistive to our own and other's stress levels.
See also Managing the Risk of Burnout