What it means when people say Agile doesn't work

We still hear leaders and teams say Agile styled project management doesn't work for them. In most cases, they haven't done it. It's not failing. It's not yet tried. It's possible to dabble, even poorly, with parts of Agile and yes, those parts could make things worse. It's a wholistic methodology. Not adopting the whole is like hoping a recipe turns out using half the ingredients and instructions.