constructive

Short definition from Wiktionary

Adjective

1. 1
   Relating to or causing construction.
2. 2
   Carefully considered and meant to be helpful.
3. 3
   Serving a useful purpose.
4. 4
   Deemed after the fact to exist or to have occurred, despite the formal process not having been followed; often when there was no intention to do so at the time.
5. 5
   Not direct or expressed, but inferred.