back in my university years, we had a teacher that taught all his courses in the lab. he used to go in, explain something for 15 minutes then the rest is practicing on the computers.

the best part was: he never gave us final exams. it was our choice with a final project and an exam. we surely picked the final project.

this is how programming classes should be taught. he took this approach because he was himself a programmer and knew how much practicing was important . Respect for these teachers.

So I sign a contract for a new app with a client and in the contract we mentioned that a down payment should be payed upon signature. Then when we signed they postponed the payments for 4 days then after 4 days for another 4 days which is next week.

I informed them that the work is paused until they prepare the down payment. The problem here is should i change the contract with new dates or it's fine to leave it as is?

I wish i can only work on my apps.

client kept changing in app for 6 months then complained that it took too much to finalize and other people might release the same app before his.

so i got this client i'm developing a mobile app for. i don't have a contract with him and i'm afraid he doesn't pay after the app goes live. any recommendations how to make the app obsolete if he doesn't pay.