Why How Laddering

#method5 mentions


Why/How Laddering is a way of reframing a problem or challenge by complementing its initial statement with more abstract and more concrete statements. Moving up the ladder expands the scope and helps see larger patterns and deeper needs, moving down helps find different concrete solutions.



Why/How Laddering helps you see larger patterns and overarching questions by moving up in abstraction, and find innovative solutions to your problem by moving down on alternative paths.

You can use it alone, but it’s more effective in a group of 3–6 people who bring different perspectives. Use a physical or virtual whiteboard and sticky notes and do the following steps:

  1. Write down your initial problem statement or challenge on a sticky note and put it at the centre of the whiteboard.
  2. Move up the ladder by asking “why?”. Do this repeatedly and write down the answers onto sticky notes as new, broader statements. Place each of them on the board above the initial statement, according to its level of abstraction. At a certain point, you’ll reach a very common, abstract need such as “health” or “happiness“. This is the top of the ladder. This process helps you frame the initial problem differently.
  3. Move down the ladder by asking “how?”. Start with different sticky notes and explore alternatives, writing down the answers as new, narrower statements. Place them on the board above, at the level of or below the initial statement, according to their level of abstraction. This helps you identify alternative ways to fulfil the needs needs behind the initial problem, and find points of departure for concrete solutions.
  4. Scan the emerging map of statements for patterns that can further inform your ideation, e.g. parallel ladders representing different causal mechanisms, different and potentially competing ultimate goals at the top, or differences in detail between different areas of the map, which point to differences in knowledge about these areas.




Why/How Laddering is at its core a bottom-up Causal Model of a problem space, i.e. a Complex System. Similar to Concept Mapping, it can suggest that a bottom-up mapping of such a system can generate a complete description of it. In reality, we will often overlook or severely misjudge elements of its Causal Structure.

As a consequence, the method should be used as a Heuristic Device and embedded in an iterative process in which we Launch safe-to-fail probes and adapt models continuously.


Why/How Laddering, also known as Abstraction Laddering, was originally developed by Sidney J. Parnes at the International Center for Studies in Creativity at Buffalo State College in the 1950–60s as part of the so-called Creative Problem Solving process.

Parnes’s colleague Min Basadur further developed the method into what he called Challenge Mapping or “Why-what’s stopping” analysis since the mid-1970s, culminating in Basadur (1994) .

From there the method got adopted in Design Thinking, mostly under the title of Why/How or How/Why Laddering.