Many people use the following:

Diener, E., Emmons, R. A., Larsen, R. J., & Griffin, S. (1985). The Satisfaction With Life Scale. Journal of Personality Assessment, 49(1), 71. doi:10.1207/s15327752jpa4901_13

I guess you refer to the concept of "job satisfaction", i.e. how much people like their jobs, or do you actually mean "happiness"? The former has mostly been measured using self-report questionnaires and scales that can broadly be divided into two categories: (A) facet measures (assessing satisfaction with specific aspects of a job, e.g. coworkers or working conditions) vs. (B) global measures (focussing on overall appraisal of a job). The most popular facet measures of job satisfaction are the JDI (Job Descriptive Index), the MSQ (Minnesota Satisfaction Questionnaire), and the JSS (Job Satisfaction Survey). The aforementioned "Satisfaction With Life Scale" (SWLS) was designed to measure global cognitive judgments of satisfaction with one's life and seems a little less job specific to me.

The concept of job satisfaction, rather than that of happiness, may indeed lend itself to gauging engagement in the workplace. Wagner and Harter (2006), for instance, identified 12 elements of great managing that conduce satisfaction:

• I know what is expected of me at work.
• I have the materials and equipment I need to do my work right.
• At work, I have the opportunity to do what I do best every day.
• In the last 7 days, I have received recognition or praise for doing good work.
• My supervisor, or someone at work, seems to care about me as a person.
• There is someone at work who encourages my development.
• At work, my opinions seem to count.
• The mission or purpose of my organization makes me feel my job is important.
• My associates or fellow employees are committed to doing quality work.
• I have a best friend at work.
• In the last 6 months, someone at work has talked to me about my progress.
• This last year, I have had opportunities at work to learn and grow.

Wagner, R. & Harter, J. 2006. 12: The Elements of Great Managing. Gallup Press.

Article Engaging Staff in the Workplace

PS: The workplace is where we spend most of our time and thus the perfect location to also promote health and well-being with a huge impact beyond the working environment, for instance in families and communities. Workplace well-being relates to all aspects of working life, from the quality and safety of the physical environment, to how workers feel about their work, their working environment, the climate at work, and the organization of work.

https://vimeo.com/185643099

Thank you so much Olivier Serrat for your contribution to my research. Indeed it is very useful. I shall get in touch with you to get more ideas and the steps to follow.

So kind of you