I'm confused about the one to use, should I say

The Lecturers are already on the system


The Lecturers are already in the system

  • Not nearly enough info. What is "the system"? If it's a public address system they are on it. If it's a computerized database of lecturers they are in it.
    – Hot Licks
    Jun 12, 2017 at 12:00

1 Answer 1


Your question is slightly misleading as you refer to input in the title, but then ignore it is the body of the question.

Regardless, you can not use on with the verb to input, but use can use both in and on with the verb to put.

Therefore, you can

put someone/something on to the system


put someone/something into the system

Either is correct, and commonly used, although I would argue that on is more likely to be used in an informal sense or by non-technical people.

However, you can only

input someone/something in to the system

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