This is by far the weakest form and you should avoid using it on your Affirmative case. Gap inherency means there is no law or attitude preventing action, but we just haven't acted yet. Topicality - Topicality is designed to check abuse. It can be run from any word in the resolution. For example, regarding the 98-99 Russia resolution, if a plan is not towards Russia, you could run topicality on the word towards.
Topicality is over used, but it is a vital stock issue because it cuts squirrelly Affirmative cases.
When arguing Topicality on the Negative, it is customary to define one or more of the words in the resolution. Then you should explain how the Affirmative's case does not meet the definition you provide. This is called a violation of the resolution. Next you should provide some standards to evaluate your definition. These are basically reasons why your interpretation should be accepted.