| (1) | be patient; |
| (2) | be careful and do not avoid troubles; |
| (3) | be systematic and make records for your works; |
| (4) | make conclusion carefully and exclude the distracting data; |
| (5) | select proper experiment material to shorten the time required; |
| (6) | Eventually, to have good luck. Taken Mendel as example, if the traits he studied were not on different chromosomes, he could never formulate hypotheses. |