Formative assessment will help in reinforcing effort because like reinforcing effort the focus is on the quality of work, not the quantity, and formative assessment. Students needed to be praised when they put forth effort and know that messing up is part of the learning process. We have all done things wrong the goal should be realize mistakes and learn from them, because like it or not we are all going to make mistakes.
A rubric can be used formatively and summatively, because students can use the rubric to assess how they are doing throughout the task and the teacher can use the rubric at the end for a final evaluation.
To be honest I haven't seen any true formative assessment, other than the host teacher or I asking questions orally to assess student understanding. I have retaught material when students don't seem to understand what was asked.
The formative assessment should always focus on the task not the student. Timing is key if the task is something new or difficult early formative assessment is the best approach, if the task is routine or easy for the students it is better to wait longer to do a formative assessment because students need a chance to assess their own work or it seems like you are doubting their abilities to them.
Many teachers don't know how to perform high quality assessment as opposed to under-conceptualized assessment. Parents and the community may question the technique if students are only receiving comments and peer assessment on their work, so those involved need to me made aware of the strategy before it is implemented. Making assessment appropriate for all learners is also difficult.