There are several methodologies for collecting data for semantic distances between word concepts.
Most methods obtain information reflecting only declarative knowledge.
Few if any of these methods attempt to capture both declarative and procedural knowledge present in the internal mental representations. The results show that hierarchical cluster analysis generated the most comprehensible and coherent solution for the phone commands, while none of the statistical analyses generated an acceptable solution for the ATM commands. It may be possible that procedural knowledge is not only difficult to express verbally, but also difficult to state explicitly or describe formally. Some previous studies indicate that users may not be able to easily give very accurate information regarding their procedural knolwledge of a system.