Which is correct?
- Following Tim's recommendations in the past has not led to good outcomes.
- Following Tim's recommendations in the past have not led to good outcomes.
Which is correct?
- Following Tim's recommendations in the past has not led to good outcomes.
- Following Tim's recommendations in the past have not led to good outcomes.
This sentence is an example of a gerund phrase. Gerund phrases act in the sentence as nouns, and are treated as singular in number. Therefore, the gerund phrase Following Tim's recommendations in the past takes a singular verb, has, giving Following Tim's recommendations in the past has not led to good outcomes.
If, however, the phrase had omitted the gerund, and was Tim's recommendations in the past, you would then have a plural noun, recommendations, and as such would take the plural verb, have, giving Tim's recommendations in the past have not led to good outcomes.