No sooner had Daniel Goleman's theory of emotional intelligence come on the scene in the 1990s than we found ourselves applying it to the workplace, with new importance given to being aware and understanding the role of our emotions when relating to colleagues.
With the principles of emotional intelligence (EQ) now firmly entrenched in leadership concepts, another emergent trend is working its way into people development practice: spiritual intelligence (SQ).
"We've taken EQ as far as we can go, and it's not enough for what we need," says Danah Zohar, management guru and leading proponent of spiritual intelligence. "If you really want to motivate people and get them to give their best, you need to tap into what's meaningful and valuable to them."
Notions of spirituality are sweeping across popular culture these days, with reality TV shows such as Channel 4's Spirituality Shopper and the BBC's The Monastery featuring stressed-out citizens of the 21st century sampling an array of faiths or taking up the monastic life in a quest for inner calm and tranquillity.
Zohar describes SQ as what we use to develop our longing and capacity for meaning, vision and value in life. It's about the role our beliefs and values play in the actions and decisions we take - and that includes work.
"There's a growing leadership crisis in business," says Zohar. "A lot of young people want more out of life than just money. To attract the brightest and best, young people are demanding more of a sense of purpose and meaning from their working life."
Michael Rennie, director of global consultancy McKinsey's mindsets and capabilities practice, agrees.
"If you look at what brings energy into a team, increasingly it's about the idea that we are people, not machines. You do that through a combination of values and high purpose - spiritual intelligence, for lack of a better term - coupled with the right sort of interactions and learning.
"People are two to five times more productive in that kind of environment. That is what's required in companies today - to be collaborative to succeed. The big thing to come out of this is for leaders to realise that meaning is the big motivating driver."
There's a definite overlap between SQ and EQ. In fact, the first principle of SQ, according to Zohar and co-author of Spiritual Intelligence and Spiritual Capital Ian