It doesn't look too bad. I would highly recommend you NOT name your primary key ID in every table. You should give it a descriptive name. ListID for example. Otherwise you will be committing what I consider a major sin (A column name should remain consistent throughout the entire database). I am not sure what the TaskNameList table is for. The first 3 tables are a pretty straight forward parent/child/grandchild. The relationship is 1:* so there is no need for the the last table. What would help even more would be to have ddl along with constraints. Then we can get a better idea of what you are doing.