Discrepancy Matrix

Discrepancy Matrix

In Child Protection in Scotland, a Discrepancy Matrix (often called Wonnacott's Discrepancy Matrix) is a tool for practitioners to analyze information by categorizing it into Evidence, Ambiguous, Assumptions, and Missing information, helping to identify gaps, challenge biases, and form robust plans within the GIRFEC (Getting It Right For Every Child) framework, particularly to assess needs against wellbeing indicators and strengthen protective factors. It's used in supervision and case analysis to move beyond surface-level understanding, explore professional curiosity, and decide on the right support for children and families.

How to use Discrepancy Matrix

Step One: Telling the story...

Whether you use Discrepancy Matrix within the supervision or just decided that it will be a good tool to reflect alone on the information you have, the good starting point is to ask yourself questions such as:

Step Two: Sorting information...

The information is sorted into the four areas as you answer the questions.

  1. What do I know? 

    For something to go into the ‘evidence’ category, it needs to be proven and verified (in other words, come from more than one source as a fact). Evidence also includes knowledge about legal frameworks  as well as research. This category provides the strongest factual evidence for analysis and decision-making.

  2. What is ambiguous? 

    This relates to information that is not properly understood, is only hearsay or has more than one meaning dependant on context, or is hinted at by others but not clarified or owned.

  1. What I think I know?

    This allows you to explore your own practice wisdom and also prejudices to see how this is informing the case. Emotion and values can also be explored in this area and you can explore how they are responding and reacting to risk.

  1. What is missing? 

These are the requests for information coming from the people listening to the story (supervisors, peers, other agency staff) that prompt you to acknowledge there are gaps in the information. The gaps then have to be examined to see if the lack of information might have a bearing on the decision-making in the case; if so, it needs to be explored.

Step Three: Reflections

Once the exercise is complete you may ask yourself:

  1. What has changed about what you know?
  2. What do you still need to know?
  3. What does this mean for the adult or adult & carer?
  4. What do you want to do next?

Discrepancy Matrix template


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