Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE Project_outcomes ( project_id VARCHAR )
TABLE: CREATE TABLE Project_Staff ( staff_id VARCHAR, role_code VARCHAR, project_id VARCHAR )
TABLE: CREATE TABLE Staff_Roles ( role_description VARCHAR, role_code VARCHAR )

### Question ###
Show the role description and the id of the project staff involved in most number of project outcomes?

### Accurate SQL ###

SELECT T1.role_description, T2.staff_id FROM Staff_Roles AS T1 JOIN Project_Staff AS T2 ON T1.role_code = T2.role_code JOIN Project_outcomes AS T3 ON T2.project_id = T3.project_id GROUP BY T2.staff_id ORDER BY COUNT(*) DESC LIMIT 1