You will not be able to calculate any index value until you have run thorough quality controls using the 'QA record' button.
The QA procedures will check spot-check and sweep-up data for any incomplete information and logical errors.
The information window will contain the list of all found errors (see below). You can open the information window separately as a pop-up window by double-clicking on it.
Errors are colour-coded on the form (see image below)
Once the QA procedures are passed (just click the QA button again), the buttons for analysing the data and calculating indices will be activated.