The combination of different observations taken under the same conditions contrary to simply trying one's best to observe and record a single observation accurately.

being healthy & trying one's best not to get injured will be the most important issue for the players to deal with.

'It is important to keep to commitments, always try one's best, and take one's responsibilities as an athlete seriously.'

'One tries one's best.'

If we can never be certain that we have stated every objective we might have, in the clearest form, and with the most practical means of testing whether it has been achieved, this does not mean that we abandon the attempt or that to try one's best under the circumstances is not a helpful activity.