Dear Maria,
The best way to keep track of who did what is to use "coding assignments", when done correctly, this allows you to know how many items have been assigned to each reviewer, how many of them have been coded and how many have not. It also gives direct access to the "remaining" pools: that's the list of items that belong to a given assignment and have not been coded yet.
The details depend on whether you are running a double/multiple screening exercise (where at least some items are blindly screened by more than one person) or not, so I will not try to cover all details (see the "Allocating references for coding" chapter in the manual, from page 46 on) but will only sketch the procedure below:
1) Create an "administrative" code-set, configured for single user data entry.
2) Make sure the screening code-set is configured properly (this should not be the same code-set as the one created in 1!), it should be set for "multiple user data entry" only if (and while) you are running a double/multiple blind screening process. If each item is to be evaluated by one person only, the screening code-set should be set for "single user data entry".
3) Create some codes in the administrative set and assign them to the to-be-screened items. This can be done via the random-allocation feature or manually. In the end you will have the to-be-screened items assigned to different "administrative" codes, details will vary depending on your specific needs.
4) In the "collaborate" tab, create the corresponding number of coding allocation, using the codes created above to assign different groups of items to different reviewers.
It's done: the "coding assignment" table in the collaborate tab will show the detailed up-to-date figures for all reviewers. The similar table on the "my info" tab will only show coding assignments that belong to the logged-on user.
Also note: if you want to force a double-blind coding exercise, you can use the coding-only interface and "Role" (page 52). You can give the coding only role to any reviewer via the "Account manager" (tab above, in this website, not in EPPI-Reviewer), people with this role will be forced to use the coding only interface. They will have access only to the items that have been allocated to them and will not be able to find out what other people have coded.
Finally: you can also get useful figures in two other ways. To glance at how the screening is proceeding (assuming the screening code-set is in "single user" mode), you can use the frequencies and crosstabs tabs in the main screen.
To see how many items have been coded, by whom (with limitations, will not go into the details), and on what code-set, you can also look at the "review statistics" tab in the lower right corner.
I hope this helps, but please do come back to us if you need detailed instructions (if that's the case, please provide details of what you've tried and what you want to achieve).
Best wishes,
Sergio