Visual challenges develop thinking and creativity. They are not about right or wrong. They give learners the chance to discover many different ways of being right.
Each challenge provides opportunities to assess thinking skills and creativity. Each activity uses questions to prompt thinking. The children's answers reveal their current ability and suggest their next steps.
For example, in Links, the children may need to connect Telegraph Pole with Sheep. A simple progression to look out for might be:
Children need further prompts such as: Do they share a colour? Do they share a texture? Do they share a shape?
Children give lower order answers such as: They both stay up straight; They both have brown or dark colour
Children give higher order answers such as: They are both 'wiry'; They both vibrate (wires in the wind/baaing)
Each challenge provides unique opportunities to develop the concept that "Assessment IS Learning". You'll need to listen carefully to the children's thoughts and have some idea of how their thinking will develop in each task. A good starting point to develop a progression is Bloom's Taxonomy (though there are many other thinking taxonomies out there):
Knowledge - Understanding - Application - Analysis - Synthesis - Evaluation